ProfileJosh completed his undergraduate studies at the University of Waterloo in Mathematical Physics. After being introduced to quantum computing at D-Wave Systems Inc. in Vancouver, he joined the IQC for his undergraduate thesis.
From 2006-2008, Josh joined IQIS and completed a Master's degree in Quantum Communication under Prof. Wolfgang Tittel. In 2009 he started his Ph.D. working on quantum repeaters and fundamental tests of quantum theory.
Quantum Communication
Quantum Optics
Quantum Information
Outputs
| Title | Category | Date | Authors |
| A microstructured fiber source of photon pairs at widely separated wavelengths University of Calgary, The University of Calgary | Publication | 2010-01-01 | J. Slater, J. -. Corbeil, S. Virally, F. Bussières, A. Kudlinski, G. Bouwmans, S. Lacroix, N. Godbout, W. Tittel | | Real-world proof-of-principle demonstration of measurement-device independent quantum key distribution University of Calgary | Presentation | 2013-11-04 | J. Slater | | Quantum repeaters with broadband waveguide quantum memories University of Calgary | Presentation | 2013-11-04 | J. Slater | | Quantum repeaters with broadband waveguide quantum memories University of Calgary | Presentation | 2013-09-04 | J. Slater | | Quantum repeaters with a broadband waveguide quantum memory University of Calgary | Presentation | 2013-09-04 | J. Slater | | Quantum repeaters with broadband waveguide quantum memory University of Calgary, The University of Calgary | Presentation | 2013-11-25 | J. Slater, E. Saglamyurek, N. Sinclair, J. Jin, H. Mallahzadeh, L. P. Grimau, L. Giner, F. Bussières, M. Hedges, D. Oblak, C. Simon, M. George, R. Ricken, C. Simon, W. Tittel | | Measurement-device-independent quantum key distribution University of Calgary | Presentation | 2014-09-04 | J. Slater | | Real-world measurement-device-indepent quantum key distribution across the Calgary quantum network University of Calgary | Presentation | 2014-01-24 | J. Slater | | Towards the Production of Entangled Photon Pairs in Optical Fiber via Four-Wave MixingPrevious experiments on the production of entangled photon pairs directly in optical fiber via four-wave mixing (FWM) have used a single pump laser and produced signal and idler photons with similar wavelengths. We will present the first results of our investigation into the production of widely separated entangled photon pairs via FWM in optical fiber using multiple pump lasers also at widely separated wavelengths. This source will have important applications in quantum cryptography and computation. As fiber optic and free space quantum communication networks require photons at different wavelengths (1550 nm and around 800 respectively) this source will make hybrid quantum cryptography networks achievable and could also be used as a heralded optical fiber source of single photons. University of Calgary, The University of Calgary | Presentation | 2007-06-02 | J. Slater, F. Bussières, N. Godbout, W. Tittel | | Towards the production of entangled photon pairs in optical fiber via four-wave mixingPrevious experiments on the production of entangled photon pairs directly in optical fiber via four-wave mixing (FWM) have used a single pump laser and produced signal and idler photons with similar wavelengths. We will present the first results of our investigation into the production of widely separated entangled photon pairs via FWM in optical fiber using multiple pump lasers also at widely separated wavelengths. This source will have important applications in quantum cryptography and computation. As fiber optic and free space quantum communication networks require photons at different wavelengths (1550 nm and around 800 respectively) this source will make hybrid quantum cryptography networks achievable and could also be used as a heralded optical fiber source of single photons. University of Calgary, The University of Calgary | Presentation | 2007-06-20 | J. Slater, F. Bussières, N. Godbout, W. Tittel | | A simple method to characterize a synchronous heralded single photon sourceAs quantum cryptography and communication continue to develop, the need for true sources of single photon is continuously growing. The production of photon pairs through 2nd and 3rd order non-linear processes in crystals and optical fibre is a simple method for constructing a high quality heralded single photon source (HSPS). The ability to employ such sources for quantum communication depends on the multi-pair statistics of the source, which is conventionally characterized by measuring the second order autocorrelation function, g2(0) with a Hanbury Brown and Twiss (HBT) experimental setup. In practice, a HBT experiment can be difficult to realize, especially when the source is of high quality. We will present a fast and simple method to predict the g2(0) of a HSPS based on nonlinear crystals or optical fibre and show agreement with results from a standard HBT experiment using a PPLN crystal. We will also report on our progress towards repeating the experiment using a microstructured fibre having nonlinear properties tailored to create a HSPS at telecom wavelengths. University of Calgary, The University of Calgary | Presentation | 2008-06-10 | J. Slater, F. Bussières, Y. Soudagar, S. Lacroix, N. Godbout, W. Tittel | | Implementations of quantum protocols on optical networks: entanglement & time‐bin qubits University of Calgary, The University of Calgary | Presentation | 2011-11-04 | J. Slater, J. Jin, M. Lamont, W. Tittel | | Towards quantum repeaters based on frequency multiplexing in RE lon doped solids University of Calgary, The University of Calgary | Presentation | 2013-07-17 | J. Slater, N. Sinclair, E. Saglamyurek, H. Mallahzadeh, J. Jin, M. George, R. Ricken, M. Hedges, D. Oblak, C. Simon, W. Tittel | | Real-world proof-of-principle demonstration of measurement-device independent quantum key distribution University of Calgary | Presentation | 2013-10-15 | J. Slater | | Real-world proof-of-principle demonstration of measurement-device independent quantum key distribution University of Calgary, The University of Calgary | Presentation | 2013-10-16 | J. Slater, A. Rubenok, P. Chan, I. Lucio Martinez, R. Valivarthi, W. Tittel | | Quantum repeaters with broadband waveguide quantum memory University of Calgary, The University of Calgary | Presentation | 2013-09-26 | J. Slater, E. Saglamyurek, N. Sinclair, J. Jin, H. Mallahzadeh, L. P. Grimau, F. Bussières, M. Hedges, D. Oblak, C. Simon, M. George, R. Ricken, C. Simon, W. Tittel | | Quantum repeaters with broadband waveguide quantum memory University of Calgary, The University of Calgary | Presentation | 2013-09-20 | J. Slater, E. Saglamyurek, N. Sinclair, J. Jin, H. Mallahzadeh, L. P. Grimau, F. Bussières, M. Hedges, D. Oblak, C. Simon, M. George, R. Ricken, C. Simon, W. Tittel | | Real-World Two-Photon Interference and Proof-of-Principle Quantum Key Distribution Immune to Detector Attacks University of Calgary, The University of Calgary | Publication | 2013-09-01 | A. Rubenok, J. Slater, P. Chan, I. Lucio Martinez, W. Tittel | | Modeling a measurement-device-independent quantum key distribution system University of Calgary, The University of Calgary | Publication | 2014-01-01 | P. Chan, J. Slater, I. Lucio Martinez, A. Rubenok, W. Tittel | | Fast and simple characterization of a photon pair source University of Calgary, The University of Calgary | Publication | 2008-01-01 | F. Bussières, J. Slater, N. Godbout, W. Tittel | | Hybrid entanglement for optical quantum networksA global optical quantum communication network will have to operate with different encodings of quantum information (QI) depending on the medium in which the photons are carried. Polarization qubits in the visible spectrum are well suited for free-space transmission due to the absence of birefringence in the air, whereas time-bin qubits at telecom wavelengths are more suited for optical fiber transmission due to their resistance to polarization mode dispersion.
We present a scheme to generate hybrid photonic entanglement defined as entanglement between different encodings of QI using light. In this specific case we consider a time-bin photon at 1550 nm entangled with a polarization photon at 805 nm and we report on our progress towards creating such a source using parametric down-conversion in bulk crystals. We also show how to teleport a polarization qubit to a time-bin qubit using this type of entanglement. Finally, we discuss how this allows QI to be distributed over optical quantum networks interfacing free-space and optical fiber links hence increasing the versatility of such networks. University of Calgary, The University of Calgary | Presentation | 2007-06-07 | F. Bussières, J. Slater, A. Rubenok, J. Nguyen, N. Godbout, S. Lacroix, W. Tittel | | Towards Hybrid Quantum Key DistributionWe present a scheme for quantum key distribution based on hybrid entanglement. The idea is to couple a free-space link with an optical fibre link by generating polarization qubits in the visible spectrum entangled with time-bin qubits in the telecom window. We discuss two ways to generate this type of entanglement: Using parametric downconversion in a periodically-poled crystal or using four-wave mixing in optical fibres. We also discuss how hybrid entanglement is an interesting way to extend the range of quantum key distribution. University of Calgary, The University of Calgary | Presentation | 2007-06-18 | F. Bussières, J. Slater, A. Rubenok, J. Nguyen, N. Godbout, S. Lacroix, W. Tittel | | Hybrid entanglement for optical quantum networks University of Calgary, The University of Calgary | Presentation | 2007-08-25 | F. Bussières, J. Slater, A. Rubenok, J. Nguyen, N. Godbout, S. Lacroix, W. Tittel | | A quantum tale of different, yet inseparable photonsQuantum communication, the art of transferring
quantum bits at a distance, requires reliable sources of entangled photons. We report on our efforts to create entangled photon pairs at widely separated wavelengths through three-wave mixing (parametric downconversion) in bulk PPLN crystals and four-wave mixing in microstructured
fibre. As a benefit, we show how this approach also provided us with a high-quality source of single photon and we report on a fast and simple
method we developed to characterize the desired suppression of multiphotons events. University of Calgary, The University of Calgary | Presentation | 2008-06-09 | F. Bussières, J. Slater, Y. Soudagar, S. Lacroix, N. Godbout, W. Tittel | | Hybrid entanglement for quantum communication University of Calgary, The University of Calgary | Presentation | 2008-08-20 | F. Bussières, J. Slater, N. Godbout, W. Tittel | | A quantum key distribution system immune to detector attacks University of Calgary, The University of Calgary | Presentation | 2012-08-02 | A. Rubenok, J. Slater, P. Chan, I. Lucio Martinez, W. Tittel | | Real-world proof-of-principle demonstration of measurement-device independent quantum key distribution University of Calgary, The University of Calgary | Presentation | 2013-11-28 | A. Rubenok, J. Slater, P. Chan, I. Lucio Martinez, R. Valivarthi, W. Tittel | | Hybrid entanglement for optical quantum networksA global optical quantum communication network will have to operate with different encodings of quantum information (QI) depending on the medium in which the photons are carried. Polarization qubits in the visible spectrum are well suited for free-space transmission due to the absence of birefringence in the air, whereas time-bin qubits at telecom wavelengths are more suited for optical fiber transmission due to their resistance to polarization mode dispersion.
We present a scheme to generate hybrid photonic entanglement defined as entanglement between different encodings of QI using light. In this specific case we consider a time-bin photon at 1550 nm entangled with a polarization photon at 805 nm and we report on our progress towards creating such a source using parametric down-conversion in bulk crystals. We also show how to teleport a polarization qubit to a time-bin qubit using this type of entanglement. Finally, we discuss how this allows QI to be distributed over optical quantum networks interfacing free-space and optical fiber links hence increasing the versatility of such networks. University of Calgary, The University of Calgary | Presentation | 2007-06-08 | F. Bussières, J. Slater, A. Rubenok, J. Nguyen, N. Godbout, S. Lacroix, W. Tittel | | Hybrid photonic entanglement using a PPLN crystalWe propose a scheme to generate hybrid photonic entanglement, defined as entanglement between photonic qubits with different encodings, using quasi phase-matched parametric downconversion in a periodically-poled lithium niobate (PPLN) crystal. The hybrid entanglement is obtained by first generating two time-bin entangled qubits at 810 and 1550 nm. Then, using standard fibre telecom components, the 810~nm qubit is deterministically converted to a polarization qubit which can be transmitted in free-space. We report on our progress towards building and characterizing such a source and discuss its utility in creating hybrid quantum networks. University of Calgary, The University of Calgary | Presentation | 2007-06-20 | F. Bussières, J. Slater, A. Rubenok, J. Nguyen, N. Godbout, W. Tittel | | Towards photonic hybrid entanglement University of Calgary, The University of Calgary | Presentation | 2007-09-20 | F. Bussières, J. Slater, A. Rubenok, J. Nguyen, N. Godbout, W. Tittel | | Budget entanglement: a compact and intrinsically stable source of polarization entangled photonsQuantum theory predicts the existence of entanglement, a bizarre and counterintuitive property that some once viewed as being incompatible with any "reasonable definition of reality" [1]. Experimental results, such as tests of Bell inequalities [2], have since shown that entanglement is not merely a mystery of quantum theory, but also, a resource that exists, can be observed, and can be exploited to expand the realm of what is possible in fields such as computation and communication. In this talk we will present a novel source of entanglement and some experimental results of its characterization. This inexpensive, compact, and robust source produces polarization entangled photon pairs at non-degenerate wavelengths of 810 nm and 1550 nm, uses commercially available non-linear crystals configured in a Sagnac interferometer, and is pumped by an inexpensive laser pointer. It requires no active stabilization and produces uncorrected entanglement visibilities exceeding 96%. This source shows great promise for future applications in practical systems as well as for use in testing Bell inequalities that require high visibility sources [3]. 1. A. Einstein, B. Podolsky, N. Rosen, "Can Quantum-Mechanical Description of Physical Reality Be Considered Complete?", Physical Review 47 , 777-780, 1935 2. A. Aspect, "Bell's inequality test: more ideal than ever", Nature, 398, 189-190, 1999. 3. N. Brunner, N. Gisin, "Partial list of Bell inequalities with four binary settings", Phys. Rev. A. 372, 3162-3167, 2008. University of Calgary, The University of Calgary | Presentation | 2009-06-09 | T. Stuart, J. Slater, F. Bussières, W. Tittel | | Photons Annoncés Générés dans une Fibre MicrostructuréeNous avons réalisé et testé expérimentalement une source de photons annoncés. La génération se fait par mélange à quatre ondes dans une fibre microstructurée. L’annonce des photons uniques est faite à 810 nm, c’est-à-dire dans une plage de longueurs d’onde aisément détectables. L’émission `a 1550 nm rend la source particulièrement intéressante pour les applications en information quantique. University of Calgary, The University of Calgary | Presentation | 2009-07-07 | J. -. Corbeil, J. Slater, G. Bouwmans, S. Virally, F. Bussières, S. Lacroix, N. Godbout, W. Tittel | | Measuring entanglement with universal time-bin qubit analyzers University of Calgary, The University of Calgary | Presentation | 2009-07-30 | F. Bussières, J. Slater, J. Jin, N. Godbout, W. Tittel | | Convertible quantum encodings and hybrid entanglement on a real-world fiber link University of Calgary, The University of Calgary | Presentation | 2009-08-04 | F. Bussières, J. Slater, J. Jin, N. Godbout, S. Hosier, W. Tittel | | An experimental test of all theories with predictive power beyond quantum theory University of Calgary, The University of Calgary | Presentation | 2011-06-15 | T. Stuart, J. Slater, W. Tittel, R. Renner, R. Colbeck | | An experimental bound on the maximum predictive power of physical theories University of Calgary, The University of Calgary | Presentation | 2012-06-13 | T. Stuart, J. Slater, R. Colbeck, R. Renner, W. Tittel | | Proof-of-principle demonstration of quantum key distribution immune to detector attacks over deployed optical fibre. University of Calgary, The University of Calgary | Presentation | 2012-06-14 | A. Rubenok, J. Slater, P. Chan, I. Lucio Martinez, W. Tittel | | Proof-of-principle demonstration of quantum key distribution immune to detector attacks over deployed optical fiber University of Calgary, The University of Calgary | Presentation | 2012-07-27 | A. Rubenok, J. Slater, P. Chan, I. Lucio Martinez, W. Tittel | | An experimental bound on the maximum predictive power of physical theories University of Calgary, The University of Calgary | Presentation | 2012-07-26 | T. Stuart, J. Slater, R. Colbeck, R. Renner, W. Tittel | | Proof-of-principle demonstration of QKD immune to detector attacks University of Calgary, The University of Calgary | Presentation | 2012-08-29 | A. Rubenok, J. Slater, P. Chan, I. Lucio Martinez, W. Tittel | | A quantum key distribution system immune to detector attacks University of Calgary, The University of Calgary | Presentation | 2012-09-10 | A. Rubenok, J. Slater, P. Chan, I. Lucio Martinez, W. Tittel | | Proof-of-principle field test of quantum key distribution immune to detector attacks University of Calgary, The University of Calgary | Presentation | 2012-11-14 | A. Rubenok, J. Slater, P. Chan, I. Lucio Martinez, W. Tittel | | Real-world Bell-state measurement & proof-of-principle demonstration of QKD immune to detector attacks University of Calgary, The University of Calgary | Presentation | 2013-06-19 | A. Rubenok, J. Slater, P. Chan, I. Lucio Martinez, W. Tittel | | An experimental bound on the maximum predictive power of physical theories University of Calgary, The University of Calgary | Presentation | 2013-08-01 | T. Stuart, J. Slater, R. Colbeck, R. Renner, W. Tittel | | An experimental bound on the maximum predictive power of physical theories University of Calgary, The University of Calgary | Presentation | 2013-08-12 | T. Stuart, J. Slater, R. Colbeck, R. Renner, W. Tittel | | Real-world two-photon interference and proof-of-principle QKD immune to detector attacks University of Calgary, The University of Calgary | Presentation | 2013-07-03 | A. Rubenok, J. Slater, P. Chan, I. Lucio Martinez, W. Tittel | | Towards quantum repeaters using frequency multiplexing University of Calgary, The University of Calgary | Presentation | 2013-05-28 | L. P. Grimau, J. Slater, J. Jin, N. Sinclair, E. Saglamyurek, D. Oblak, M. Hedges, H. Mallahzadeh, W. Tittel | | An integrated processor for photonic quantum states using a broadband light-matter interface University of Calgary, The University of Calgary | Publication | 2014-01-01 | E. Saglamyurek, N. Sinclair, J. Slater, K. Heshami, D. Oblak, W. Tittel | | Fibres microstructurées pour la conception de sources non classiques de photons University of Calgary, The University of Calgary | Presentation | 2009-09-08 | S. Virally, J. -. Corbeil, J. Slater, A. Kudlinski, G. Bouwmans, L. Labonté, F. Bussières, M. Leduc, W. Tittel, N. Godbout, S. Lacroix | | Integrated quantum memory for quantum communication University of Calgary, The University of Calgary | Presentation | 2010-06-02 | E. Saglamyurek, N. Sinclair, J. Slater, J. Jin, F. Bussières, C. La Mela, W. Tittel, M. George, R. Ricken, W. Sohler | | Macroscopic quantum communications using photonic qudits The University of Calgary, University of Calgary | Presentation | 2013-12-05 | W. Tittel, N. Sinclair, J. Slater, D. Oblak, I. Lucio Martinez, L. Giner, H. Mallahzadeh, L. P. Grimau, E. Saglamyurek | | An integrated processor for photonic quantum states using a broadband light-matter interface University of Calgary, The University of Calgary | Presentation | 2014-05-28 | E. Saglamyurek, N. Sinclair, J. Slater, K. Heshami, D. Oblak, W. Tittel | | An integrated processor for photonic quantum states using a broadband light-matter interface University of Calgary, The University of Calgary | Presentation | 2014-07-14 | E. Saglamyurek, N. Sinclair, J. Slater, K. Heshami, D. Oblak, W. Tittel | | Broadband waveguide quantum memory for entangled photons University of Calgary, The University of Calgary | Publication | 2011-01-01 | E. Saglamyurek, N. Sinclair, J. Jin, J. Slater, D. Oblak, F. Bussières, M. George, R. Ricken, C. Simon, W. Tittel | | Broadband waveguide quantum memory for entangled photons University of Calgary, The University of Calgary | Presentation | 2011-01-07 | E. Saglamyurek, N. Sinclair, J. Jin, J. Slater, D. Oblak, F. Bussières, M. George, R. Ricken, C. Simon, W. Tittel | | Frequency-multiplexed photon storage and read-out on demand using an atomic frequency comb-based quantum memoryOptical quantum memories require the ability to reversibly map quantum states between photons and atoms [1]. When employed for quantum repeaters [2], quantum memories are key to enabling long-distance quantum communication. Towards this end, quantum memories require recall on demand with high fidelity and efficiency, long storage times, and the possibility to simultaneously store multiple carriers of quantum information. The combination of a quantum state storage protocol based on an atomic frequency comb (AFC) [3] with rare-earth-ion doped crystals cooled to cryogenic temperatures as storage materials [4] has been shown to meet many of these requirements. In particular, it is well suited for storage of temporally multiplexed photons [5,6]. Yet, despite first proof-of-principle demonstrations [7], recalling quantum information at a desired time (i.e. read-out on demand) with broadband, single-photon-level pulses remains an outstanding challenge.
We will present the first experimental demonstration of frequency-multiplexed storage of attenuated laser pulses followed by read-out on demand in the frequency domain. Our work is based on the AFC protocol and employs a Tm-doped LiNbO3 waveguide [8,9]. We will argue that, in view of a quantum repeater, our approach is equivalent to temporal multiplexing and read-out on demand in the temporal domain. This overcomes one further obstacle to building quantum repeaters using rare-earth-ion doped crystals as memory devices.
[1] A. I. Lvovsky, B. C. Sanders and W. Tittel. “Optical Quantum Memory”, Nature Photonics 3, 2009, 706.
[2] N. Sangouard et al. “Quantum repeaters based on atomic ensembles and linear optics”, Rev. Mod. Phys. 83, 2011, 33.
[3] M. Afzelius et al. “Multimode quantum memory based on atomic frequency combs”, Phys. Rev. A 79, 2009, 052329.
[4] W. Tittel et al. “Photon-echo quantum memory in solid state systems”, Las. Phot. Rev. 4 (2), 2010, 244.
[5] I. Usmani et al. “Mapping multiple photonic qubits into and out of one solid-state atomic ensemble”, Nature Commun. 1, 2010, 12.
[6] M. Bonarota, J.-L. Le Gouet, and T. Chanelière. “Highly multimode storage in a crystal”, New J. Phys. 13, 2011, 013013.
[7] M. Afzelius et al. “Demonstration of Atomic Frequency Comb Memory for Light with Spin- Wave Storage”, Phys. Rev. Lett. 104, 2010, 040503.
[8] E. Saglamyurek et al. “Broadband waveguide quantum memory for entangled photons”, Nature 469, 2011, 512.
[9] N. Sinclair et al. “Spectroscopic investigations of a Ti:Tm:LiNbO3 waveguide for photon-echo quantum memory”, J. Lumin. 130, 2010, 1586. University of Calgary, The University of Calgary | Presentation | 2012-08-27 | N. Sinclair, E. Saglamyurek, H. Mallahzadeh, J. Slater, C. Simon, D. Oblak, M. George, R. Ricken, C. Simon, W. Tittel | | Long distance quantum communications using quantum memories having on-demand recall in the frequency domain University of Calgary, The University of Calgary | Presentation | 2013-08-06 | N. Sinclair, E. Saglamyurek, H. Mallahzadeh, J. Slater, M. George, R. Ricken, M. Hedges, D. Oblak, W. Sohler, C. Simon, W. Tittel | | Towards entanglement swapping with quantum-memory compatible photons University of Calgary, The University of Calgary | Presentation | 2014-09-02 | J. Jin, L. P. Grimau, L. Giner, J. Slater, M. Lamont, B. V. Verma, S. M. Shaw, F. Marsili, W. S. Nam, D. Oblak, W. Tittel | | Integrated quantum memory for quantum communication University of Calgary, The University of Calgary | Presentation | 2010-07-05 | E. Saglamyurek, N. Sinclair, J. Jin, J. Slater, F. Bussières, W. Tittel, M. George, R. Ricken, W. Sohler | | Integrated quantum memory for sub-nanosecond non-classical light University of Calgary, The University of Calgary | Presentation | 2010-10-20 | E. Saglamyurek, N. Sinclair, J. Jin, J. Slater, D. Oblak, F. Bussières, W. Tittel, M. George, R. Ricken, W. Sohler | | Broadband Waveguide Quantum Memory for Entangled Photons University of Calgary, The University of Calgary | Presentation | 2011-05-20 | E. Saglamyurek, N. Sinclair, J. Jin, J. Slater, D. Oblak, F. Bussières, M. George, R. Ricken, C. Simon, W. Tittel | | Broadband waveguide quantum memory for entangled photons University of Calgary, The University of Calgary | Presentation | 2011-06-07 | E. Saglamyurek, N. Sinclair, J. Jin, J. Slater, D. Oblak, F. Bussières, M. George, R. Ricken, W. Sohler, W. Tittel | | Broadband waveguide quantum memory for entangled photons University of Calgary, The University of Calgary | Presentation | 2011-07-18 | E. Saglamyurek, N. Sinclair, J. Jin, J. Slater, D. Oblak, F. Bussières, M. George, R. Ricken, W. Sohler, W. Tittel | | A broadband, waveguide quantum memory for entangled photons University of Calgary, The University of Calgary | Presentation | 2011-07-11 | E. Saglamyurek, N. Sinclair, J. Jin, J. Slater, D. Oblak, W. Tittel, F. Bussières, M. George, R. Ricken, W. Sohler | | An experimental test of all theories with predictive power beyond quantum theory University of Calgary, The University of Calgary | Presentation | 2011-07-11 | R. Colbeck, R. Renner, T. Stuart, J. Slater, W. Tittel | | Quantum memory for quantum repeater University of Calgary, The University of Calgary | Presentation | 2011-08-28 | E. Saglamyurek, N. Sinclair, J. Jin, J. Slater, D. Oblak, F. Bussières, M. George, R. Ricken, W. Sohler, W. Tittel | | Broadband waveguide quantum memory for entangled photons University of Calgary, The University of Calgary | Presentation | 2011-06-15 | E. Saglamyurek, N. Sinclair, J. Jin, J. Slater, D. Oblak, F. Bussières, M. George, R. Ricken, C. Simon, W. Tittel | | Broadband waveguide quantum memory for entangled photons University of Calgary, The University of Calgary | Presentation | 2011-06-24 | E. Saglamyurek, N. Sinclair, J. Jin, J. Slater, D. Oblak, F. Bussières, M. George, R. Ricken, C. Simon, W. Tittel | | Broadband waveguide quantum memory for entangled photons University of Calgary, The University of Calgary | Presentation | 2011-07-26 | E. Saglamyurek, N. Sinclair, J. Jin, J. Slater, D. Oblak, F. Bussières, M. George, R. Ricken, W. Sohler, W. Tittel | | Broadband waveguide quantum memory for entangled photonsReversible mapping of quantum states, particularly entangled states, between light and matter is important for advanced applications of quantum information science. This mapping, i.e. operation of a quantum memory [1], is imperative for realizing quantum repeaters [2] and quantum networks [3]. Here we report the reversible transfer of photon–photon entanglement into entanglement between a photon and a collective atomic excitation in a solid-state device [4] (see also [5]). Specifically, we generate time-bin enangled pairs of photons [6] at the low-loss 795 nm (in free-space) and 1532 nm (in fibre) wavelengths. The 795 nm photons are sent into a thulium-doped lithium niobate waveguide cooled to 3K, absorbed by the Tm ions, and retrieved after 7 ns by means of a photon-echo quantum memory protocol employing an atomic frequency comb [7]. The acceptance bandwidth of the memory has been expanded to 5 GHz, more than one order of magnitude larger than the previous state-of-the-art [8], to match the spectral width of the filtered 795 nm photons. The entanglement-preserving nature of our storage device is assessed through quantum state tomography before and after storage. Within statistical error, we find a perfect mapping process. Furthermore, by violating the CHSH inequality [9], we directly verify the nonlocal nature of the generated and stored entangled photons.
[1] A. Lvovsky, B. C. Sanders, and W. Tittel, Optical quantum memory, Nature Photonics 3, 706-71 (2009).
[2] N. Sangouard et al., Quantum repeaters based on atomic ensembles and linear optics, Rev. Mod. Phys. 83, 33-80 (2011).
[3] H. J. Kimble, The quantum internet, Nature 453, 1023-1030 (2008).
[4] E. Saglamyurek et al., Broadband waveguide quantum memory for entangled photons, Nature 469, 512-515 (2011).
[5] C. Clausen et al., Quantum storage of photonic entanglement in a crystal, Nature 469, 508-511 (2011).
[6] I. Marcikic et al., Distribution of time-bin entangled qubits over 50 km of optical fiber, Phys. Rev. Lett. 93, 180502 (2004).
[7] M. Afzelius et al., Multimode quantum memory based on atomic frequency combs, Phys. Rev. A 79, 052329 (2009).
[8] I. Usmani et al., Mapping multiple photonic qubits into and out of one solid-state atomic ensemble, Nat. Comm. 1 (12), 1-7 (2010).
[9] J. F. Clauser et al., Proposed experiment to test local hidden-variable theories, Phys. Rev. Lett. 23, 880-884 (1969). University of Calgary, The University of Calgary | Presentation | 2011-08-10 | E. Saglamyurek, N. Sinclair, J. Jin, J. Slater, D. Oblak, F. Bussières, M. George, R. Ricken, C. Simon, W. Tittel | | Broadband waveguide quantum memory for entangled photonsQuantum information processing and communication relies on encoding information into quantum states of physical systems such as photons [1]. Actualizing a quantum interface [2] between light and matter is imperative for construction of a quantum repeater [3], which requires a faithful mapping of quantum entanglement [1] between light and matter. In this work we report the reversible transfer of photon-photon entanglement into entanglement between a photon and a collective atomic excitation in a solid-state thulium-doped lithium niobate waveguide [4] (this transfer was simultaneously done in [5]). References: [1] J.-W. Pan et al. arXiv:0805.2853, 2008. [2] A. I. Lvovsky, B. C. Sanders, & W. Tittel. Nat Photon, 3 (12): 706-714, 2009. [3] N. Sangouard et al. arXiv:0906.2699, 2009. [4] E. Saglamyurek et al. Nature, 469 (7331): 512-515, 2011. [5] C. Clausen et al. Nature, 469 (7331): 508-511, 2011. University of Calgary, The University of Calgary | Presentation | 2011-08-25 | E. Saglamyurek, N. Sinclair, J. Jin, J. Slater, D. Oblak, F. Bussières, M. George, R. Ricken, C. Simon, W. Tittel | | Quantum memory for quantum repeater University of Calgary, The University of Calgary | Presentation | 2011-09-18 | E. Saglamyurek, N. Sinclair, J. Jin, J. Slater, D. Oblak, F. Bussières, M. George, R. Ricken, C. Simon, W. Tittel | | A frequency multi-mode Tm:LiNbO3 quantum memoryOptical quantum memories require the ability to reversibly map quantum information between photons and atoms [1]. When employed for quantum repeaters, quantum memories are the key to enabling long-distance quantum communication [2]. Quantum memories require recall with high fidelity and efficiency, long storage times, large bandwidth capabilities, and the possibility to store multiple modes for multiplexing\\r\\n[3]. Attractive material candidates for quantum memories, those of rare-earth-ion doped crystals, may serve to simultaneously fulfill all aforementioned requirements [4]. In this presentation, we show how a Tm:LiNbO3 crystal [5,6] cooled to cryogenic temperatures may serve as an efficient frequency-multiplexed quantum memory. Contrasting previous works that have focused on time-multiplexing [7, 8], we present measurements showing how the wide-band absorption line and large atomic sublevel splitting in Tm:LiNbO3 can be exploited for frequency multiplexing in a quantum repeater.\\r\\n\\r\\n[1] A. I. Lvovsky et. al., Nature Photon. 3, 706(2009).\\r\\n[2] H.-J. Briegel et al., Phys. Rev. Lett. 81, 5932 (1998).\\r\\n[3] N. Sangouard et al., Rev. Mod. Phys. 83, 33 (2011).\\r\\n[4] W. Tittel et al., Laser Photon. Rev. 4, 244 (2010).\\r\\n[5] E. Saglamyurek et al., Nature (London) 469, 512 (2011).\\r\\n[6] N. Sinclair et al., J. Lumin. 130, 1586 (2010).\\r\\n[7] I. Usmani et al., Nature Commun. 1, 12 (2010).\\r\\n[8] M Bonarota et. al., New J. Phys. 13, 013013 (2011).\\r\\n University of Calgary, The University of Calgary | Presentation | 2012-06-14 | N. Sinclair, E. Saglamyurek, H. Mallahzadeh, J. Slater, C. Simon, D. Oblak, M. George, R. Ricken, W. Sohler, W. Tittel | | Two-photon interference with attenuated laser pulses stored in separate solid-state memories University of Calgary, The University of Calgary | Presentation | 2012-06-11 | J. Jin, E. Saglamyurek, N. Sinclair, J. Slater, D. Oblak, M. George, R. Ricken, W. Sohler, W. Tittel | | A frequency multi-mode Tm:LiNbO3 quantum memoryOptical quantum memories require the ability to reversibly map quantum information
between photons and atoms [1]. When employed for quantum repeaters, quantum
memories are the key to enabling long-distance quantum communication [2]. Quantum
memories require recall with high fidelity and efficiency, long storage times, large
bandwidth capabilities, and the possibility to store multiple modes for multiplexing [3].
Attractive material candidates for quantum memories, those of rare-earth-ion doped
crystals, may serve to simultaneously fulfill all aforementioned requirements [4]. In this
presentation, we show how a Tm:LiNbO3 crystal [5, 6] cooled to cryogenic temperatures
may serve as an efficient frequency-multiplexed quantum memory. Contrasting previous
works that have focused on time-multiplexing [7, 8], we present measurements showing
how the wide-band absorption line and large atomic sublevel splitting in Tm:LiNbO3 can
be exploited for frequency multiplexing in a quantum repeater.
[1] A. I. Lvovsky et. al., Nature Photon. 3, 706 (2009).
[2] H.-J. Briegel et al., Phys. Rev. Lett. 81, 5932 (1998).
[3] N. Sangouard et al., Rev. Mod. Phys. 83, 33 (2011).
[4] W. Tittel et al., Laser Photon. Rev. 4, 244 (2010).
[5] E. Saglamyurek et al., Nature (London) 469, 512 (2011).
[6] N. Sinclair et al., J. Lumin. 130, 1586 (2010).
[7] I. Usmani et al., Nature Commun. 1, 12 (2010).
[8] M Bonarota et. al., New J. Phys. 13, 013013 (2011). University of Calgary, The University of Calgary | Presentation | 2012-07-25 | N. Sinclair, E. Saglamyurek, H. Mallahzadeh, J. Slater, C. Simon, D. Oblak, M. George, R. Ricken, W. Sohler, W. Tittel | | Frequency-multiplexed photon storage and read-out on demand using an atomic frequency comb-based quantum memory University of Calgary, The University of Calgary | Presentation | 2012-09-11 | N. Sinclair, E. Saglamyurek, H. Mallahzadeh, J. Slater, J. Jin, D. Oblak, M. George, R. Ricken, C. Simon, W. Tittel | | Experiments with waveguide quantum memory for light University of Calgary, The University of Calgary | Presentation | 2012-07-23 | E. Saglamyurek, N. Sinclair, J. Jin, J. Slater, D. Oblak, F. Bussières, M. George, R. Ricken, C. Simon, W. Tittel | | Solid-state photon-echo quantum memory for quantum repeaters University of Calgary, The University of Calgary | Presentation | 2013-02-06 | E. Saglamyurek, N. Sinclair, J. Jin, J. Slater, D. Oblak, F. Bussières, M. George, R. Ricken, C. Simon, W. Tittel | | Quantum repeaters using frequency-multiplexed quantum memories University of Calgary, The University of Calgary | Presentation | 2012-08-02 | N. Sinclair, E. Saglamyurek, H. Mallahzadeh, J. Slater, J. Jin, C. Simon, D. Oblak, M. George, R. Ricken, C. Simon, W. Tittel | | Frequency multiplexed quantum memories with read-out on demand for quantum repeaters University of Calgary, The University of Calgary | Presentation | 2013-07-01 | N. Sinclair, E. Saglamyurek, H. Mallahzadeh, J. Slater, M. Hedges, M. George, R. Ricken, D. Oblak, C. Simon, W. Tittel | | Frequency-multiplexed quantum memories with read-out on demand for quantum repeaters University of Calgary, The University of Calgary | Presentation | 2013-07-15 | N. Sinclair, E. Saglamyurek, H. Mallahzadeh, J. Slater, M. Hedges, M. George, R. Ricken, D. Oblak, C. Simon, W. Tittel | | Quantum memories with read-out on demand for quantum repeaters University of Calgary, The University of Calgary | Presentation | 2013-09-16 | N. Sinclair, E. Saglamyurek, H. Mallahzadeh, J. Slater, M. George, R. Ricken, M. Hedges, D. Oblak, C. Simon, C. Simon, W. Tittel | | Quantum memory for long-distance quantum communication based on spectral multiplexing
University of Calgary, The University of Calgary | Presentation | 2014-03-04 | N. Sinclair, E. Saglamyurek, H. Mallahzadeh, J. Slater, M. George, R. Ricken, M. Hedges, D. Oblak, C. Simon, W. Tittel | | Frequency multiplexed quantum memories for quantum repeaters University of Calgary, The University of Calgary | Presentation | 2013-06-26 | N. Sinclair, E. Saglamyurek, H. Mallahzadeh, J. Slater, M. Hedges, D. Oblak, W. Tittel | | Spectrally multiplexed solid-state memories with feed-forward control for quantum repeatersWe present experimental work that demonstrates frequency-multiplexed quantum state storage in solid-state quantum memories with readout on demand. University of Calgary, The University of Calgary | Presentation | 2014-06-10 | N. Sinclair, E. Saglamyurek, H. Mallahzadeh, J. Slater, M. George, R. Ricken, M. Hedges, D. Oblak, C. Simon, C. Simon, W. Tittel | | Flipping quantum coins University of Calgary, The University of Calgary | Presentation | 2009-08-21 | G. Berlin, G. Brassard, F. Bussières, N. Godbout, J. Slater, W. Tittel | | Broadband waveguide quantum memory for entangled photons The University of Calgary, University of Calgary | Presentation | 2011-03-10 | W. Tittel, E. Saglamyurek, N. Sinclair, J. Jin, J. Slater, D. Oblak, M. George, R. Ricken, W. Sohler | | Flipping quantum coins University of Calgary, The University of Calgary | Presentation | 2009-07-30 | G. Brassard, G. Berlin, F. Bussières, N. Godbout, J. Slater, W. Tittel | | Flipping quantum coinsCoin flipping is a cryptographic primitive in which two distrustful parties wish to generate a random bit in order to choose between two alternatives. This task is impossible to realize when it relies solely on the asynchronous exchange of classical bits: one dishonest player has complete control over the final outcome. It is only when coin flipping is supplemented with quantum communication that this problem can be alleviated although partial bias remains. Unfortunately, practical systems are subject to loss of quantum data, which allows a cheater to force a bias that is complete or arbitrarily close to complete in all previous protocols. We report herein on the first implementation of a quantum coin-flipping protocol that is impervious to loss. Moreover, in the presence of unavoidable experimental noise, we propose to use this protocol sequentially to implement many coin flips, which guarantees that a cheater unwillingly reveals asymptotically, through an increased error rate, how many outcomes have been fixed. Hence, we demonstrate for the first time the possibility of flipping coins in a realistic setting. University of Calgary, The University of Calgary | Presentation | 2009-08-25 | F. Bussières, G. Berlin, G. Brassard, N. Godbout, J. Slater, W. Tittel | | Flipping quantum coins University of Calgary, The University of Calgary | Presentation | 2009-10-28 | G. Berlin, G. Brassard, F. Bussières, N. Godbout, J. Slater, W. Tittel | | Flipping quantum coins University of Calgary, The University of Calgary | Presentation | 2010-07-14 | G. Berlin, G. Brassard, F. Bussières, N. Godbout, J. Slater, W. Tittel | | High-speed characterization of quantum systems in the near-infrared University of Calgary, The University of Calgary | Presentation | 2011-04-27 | C. Healey, X. Mo, C. Dascollas, M. Lamont, J. Slater, I. Lucio Martinez, P. Chan, S. Hosier, W. Tittel | | High-speed detection of near-infrared single photons in quantum optics experiments University of Calgary, The University of Calgary | Presentation | 2011-06-13 | C. Healey, X. Mo, C. Dascollas, M. Lamont, J. Slater, I. Lucio Martinez, P. Chan, S. Hosier, W. Tittel | | Quantum memory and entanglement storage in rare-earth ion doped crystals University of Calgary, The University of Calgary | Presentation | 2011-09-04 | D. Oblak, E. Saglamyurek, N. Sinclair, J. Jin, J. Slater, M. Lamont, F. Bussières, M. George, R. Ricken, C. Simon, W. Tittel | | Quantum memory and entanglementReversibly mapping entanglement between photons and atoms, which serve as quantum memory, and projecting independent (pure) photonic quantum states after recall from such a memory onto entangled states are key to quantum repeaters and, more generally, quantum networks [1]. In this talk we present the reversible mapping of quantum information encoded into one of two time-bin entangled photons using a photon-echo quantum memory protocol [2] (for closely related work see [3]). Our results show, within experimental uncertainty, that the encoded quantum information, i.e. the property of the stored photon being one member of an entangled pair, can be retrieved without degradation. Furthermore, we will demonstrate two-photon interference and the projection onto an entangled state using attenuated pulses of light (featuring an average of less than one photon per pulse) that have, or have not, been reversibly mapped to separate quantum memories. As the interference visibility is close to the theoretical maximum, regardless of whether none, one, or both pulses have previously been stored, we conclude that our solid-state quantum memories preserve not only encoded quantum information, but the entire photonic wave function during storage. Both investigations take advantage of thulium-doped lithium niobate waveguide quantum memories as storage materials, and employ a photon-echo type quantum memory approach based on atomic frequency combs [4]. Our findings complete previously missing steps towards advanced applications of quantum information processing, and bring us closer to building quantum repeaters, networks, and linear optics quantum computers.
[1] N. Sangouard et al. “Quantum repeaters based on atomic ensembles and linear optics”, Rev. Mod. Phys. 83, 2011, 33.
[2] E. Saglamyurek et al. “Broadband waveguide quantum memory for entangled photons”, Nature 469, 2011, 512.
[3] C. Clausen et al. “Quantum storage of photonic entanglement in a crystal”, Nature 459, 2011, 508.
[4] M. Afzelius et al. “Multimode quantum memory based on atomic frequency combs”, Phys. Rev. A 79, 2009, 052329. University of Calgary, The University of Calgary | Presentation | 2012-08-27 | E. Saglamyurek, N. Sinclair, H. Mallahzadeh, J. Jin, J. Slater, D. Oblak, F. Bussières, M. George, R. Ricken, C. Simon, W. Tittel | | A quantum tale of two different yet inseparable photons University of Calgary, The University of Calgary | Presentation | 2008-06-05 | F. Bussières, N. Godbout, J. Jin, S. Lacroix, J. Nguyen, J. Slater, Y. Soudagar, T. Stuart, W. Tittel | | Measurement-device-independent QKD - the next generation University of Calgary, The University of Calgary | Presentation | 2013-08-05 | P. Chan, C. Duffin, D. Korchinski, I. Lucio Martinez, A. Rubenok, J. Slater, R. Valivarthi, W. Tittel | | Measuring entanglement with universal time-bin qubit analyzers University of Calgary, The University of Calgary | Presentation | 2009-11-06 | G. Berlin, G. Brassard, F. Bussières, N. Godbout, J. Jin, J. Slater, W. Tittel | | Long range quantum key distribution using frequency multiplexing in broadband solid state memories The University of Calgary, University of Calgary | Presentation | 2014-06-10 | H. Krovi, Z. Dutton, S. Guha, C. Fuchs, W. Tittel, C. Simon, J. Slater, K. Heshami, M. Hedges, S. G. Kanter, -. P. Huang, W. C. Thiel | | Efficient Bell state analyzer for time-bin qubits with fast-recovery WSi superconducting single photon detectors University of Calgary | Publication | 2014-01-01 | R. Valivarthi, I. Lucio Martinez, A. Rubenok, P. Chan, F. Marsili, V. B. Verma, M. D. Shaw, J. A. Stern, J. Slater, D. Oblak, e. al | | Proof-of-principle quantum key distribution immune to detector attacks over a 60 dB loss channel University of Calgary, The University of Calgary | Presentation | 2014-09-03 | R. Valivarthi, I. Lucio Martinez, P. Chan, F. Marsili, B. V. Verma, A. J. Stern, S. M. Shaw, W. S. Nam, J. Slater, D. Oblak, W. Tittel | | Quantum Information devices in rate-Earth ion doped waveguide materials University of Calgary, The University of Calgary | Presentation | 2015-01-07 | D. Oblak, N. Sinclair, E. Saglamyurek, K. Heshami, J. Jin, H. Mallahzadeh, T. Lutz, L. Veissier, J. Slater, M. Hedges, M. George, R. Ricken, B. V. Verma, F. Marsili, S. M. Shaw, W. C. Thiel, L. R. Cone, C. Simon, W. S. Nam, W. Tittel | | Quantum communication in the QC2 lab University of Calgary, The University of Calgary | Presentation | 2007-09-26 | F. Bussières, P. Chan, A. Delfan, S. Hosier, C. La Mela, I. Lucio Martinez, X. Mo, J. Nguyen, A. Rubenok, E. Saglamyurek, J. Slater, M. Underwood, W. Tittel | | Quantum communication in the QC2 lab University of Calgary, The University of Calgary | Presentation | 2007-09-26 | F. Bussières, P. Chan, A. Delfan, S. Hosier, C. La Mela, I. Lucio Martinez, X. Mo, J. Nguyen, A. Rubenok, E. Saglamyurek, J. Slater, M. Underwood, W. Tittel | | Quantum cryptography in the QC2 lab University of Calgary, The University of Calgary | Presentation | 2007-11-28 | F. Bussières, P. Chan, A. Delfan, S. Hosier, C. La Mela, I. Lucio Martinez, X. Mo, J. Nguyen, A. Rubenok, E. Saglamyurek, N. Sinclair, J. Slater, M. Underwood, W. Tittel | | Quantum Communication in the QC2 Lab University of Calgary, The University of Calgary | Presentation | 2011-07-06 | P. Chan, C. Dascollas, C. Healey, S. Hosier, J. Jin, V. Kiselyov, M. Lamont, I. Lucio Martinez, D. Oblak, A. Rubenok, E. Saglamyurek, N. Sinclair, J. Slater, T. Stuart, W. Tittel |
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