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| Title | Category | Date | Authors |
| Photon echo quantum memory and state transformation University of Calgary, The University of Calgary | Publication | 2008-01-01 | A. Delfan, C. La Mela, W. Tittel | | Photon echo quantum memory and state transformation University of Calgary, The University of Calgary | Publication | 2008-01-01 | A. Delfan, C. La Mela, W. Tittel | | Towards unambiguous quantum state discrimination in an optical memoryTowards unambiguous quantum state discrimination in an optical memory
Ahdiyeh Delfan*, Cecilia La Mela, Wolfgang Tittel
Institute for Quantum Information Science, University of Calgary,
2500 University Drive, NW Calgary, Alberta, Canada, T2N 1N4
The possibility to store and recall information encoded into quantum states of light is at the heart of many
applications of quantum information processing. For example such a quantum memory is a basic component of a
quantum repeater [1] which allows realization of quantum cryptography [2] over distances longer than 100km. A
recently proposed, photon echo related approach to quantum state storage in atomic ensembles employs controlled
reversible inhomogeneous broadening (CRIB) [3]. Beyond storage, a modified version of CRIB allows quantum
state manipulations including single qubit rotations [4, 5]. As the implementation of CRIB is currently still
challenging [6], we investigate quantum state transformation using stimulated photon echoes with the example of a
POVM (positive operator valued measure) [7].
Nonorthogonal state discrimination based on POVMs has become an interesting problem in quantum information
processing from a fundamental [7] as well as applied [8] point of view. In this kind of measurement a set of
nonorthogonal states is mapped onto a set of orthogonal ones by a non unitary transformation.
Experimental realization of POVMs is challenging as it is usually based on an optical interferometeric set up, where
stabilization is the main problem. We propose a novel implementation of POVMs that relies on quantum state
rotations based on stimulated photon echoes, which has been shown to allow a very robust implementation of
interferometeric, standard projection measurements [9]. Considering the preservation of the relative phase and
amplitude of the optical pulses, the desired interference is achieved by properly choosing the amplitude, phase and
the timing of multiple read pulses.
We will present simulations based on numerically solving Maxwell Bloch equations in an inhomogenously
broadened medium, and discuss the current experimental status.
[1]H. J. Briegel,Phys. Rev. Lett. 81, 5932(1998)
[2]N. Gisin et al,Rev. Mod. Phys,74,145(2002)
[3]S. A. Moiseev and S. Kroll, Phys Rev Lett. 87, 173601(2001)
[4]See also contributions by S. A. Moiseev et al.
[5]See also contributions by M. Underwood et al.
[6]A. L. Alexander et al, Phys. Rev.Lett.96, 043602(2006)
[7]Y. Sun et al, Phys. Rev A.64, 022311(2001)
[8]V. Scarani et al, Phys. Rev.Lett.92, 057901(2004)
[9]M. U. Staudt et al, Phys. Rev. Lett. 98, 113601 (2007)
* adelfan@ University of Calgary, The University of Calgary | Presentation | 2008-01-26 | A. Delfan, C. La Mela, W. Tittel | | Photon-echo based quantum memory and state transformation University of Calgary, The University of Calgary | Presentation | 2009-06-26 | A. Delfan, E. Saglamyurek, C. La Mela, W. Tittel | | Relaxing symmetry in CRIB: Combining quantum state storage with data transformationRelaxing symmetry in CRIB: Combining quantum state storage with data
transformation
A. Delfan1, C. La Mela1, M. S. Underwood1, K.-P. Marzlin1, S. Moiseev1,2, and W. Tittel1
1Institute for Quantum Information Science, University of Calgary, Canada
2Kazan Physical-Technical Institute, Russian Academy of Science, Russia
Quantum repeater [1], based on sources of entangled photons, quantum memory, and
single and two qubit gates plus measurements, promise overcoming the distance barrier
of quantum communication protocols. We investigate extensions of a recent quantum
memory protocol based on controlled, reversible, inhomogeneous broadening (CRIB) [2-
5] for combining quantum state storage with transformation of the absorbed quantum
data. More precisely, we relax the symmetry requirement between inhomogeneous
broadening during quantum state absorption and recall, as required for perfectly timereversed
quantum dynamics. We will discuss possibilities for single qubit rotations based
on sequential rephrasing [3], and propose an experiment based on stimulated photon
echoes [4], which serves as a test-bed for the more efficient, CRIB based realization.
Other types of quantum (or classical) data transformation arise from asymmetry in the
rate of de-and rephasing, leading to data compression or decompression [5].
[1] H. Briegel, W. Dür, I. Cirac, P. Zoller, Phys. Rev. Lett. 81, 5932(1998)
[2] S. A. Moiseev and S. Kröll, Phys Rev Lett. 87, 173601(2001),
[3] M. Nilsson and S. Kröll, Opt. Commun. 247, 292 (2005),
[4]} A. L. Alexander, J. J. Longdell, N. B. Manson, and M. J. Sellars Phys. Rev. Lett. 96,
043602 (2006).
[5] B. Kraus, W. Tittel, N. Gisin, M. Nilsson, S. Kroll, and J. I. Cirac, Phys. Rev. A. 73,
020302(R) (2006).
[6] see contribution by M.S.Underwood et al.
[7] see contribution by A. Delfan et al.
[8] see contribution by S. Moiseev et al. University of Calgary, The University of Calgary | Presentation | 2008-01-25 | A. Delfan, C. La Mela, M. Underwood, K. Marzlin, S. Moiseev, W. Tittel | | Photon echo quantum memory and state transformation University of Calgary, The University of Calgary | Presentation | 2008-01-23 | A. Delfan, C. La Mela, W. Tittel | | Beyond CRIB-based memory: combining storage with data manipulation University of Calgary, The University of Calgary | Presentation | 2008-03-18 | A. Delfan, C. La Mela, M. Underwood, K. Marzlin, S. Moiseev, W. Tittel | | Data manipulation via photon echoData Manipulation via Photon Echo\r\nAhdiyeh Delfan, Erhan Saglamyurek, Cecilia La Mela, Wolfgang Tittel\r\nInstitute for Quantum Information Science, University of Calgary,\r\n2500 University Drive, NW Calgary, Alberta, Canada, T2N 1N4\r\n\r\nThe possibility to store and recall information encoded into quantum states of light is at the heart of many applications of quantum information processing, including a quantum repeater [1]. A recently proposed approach to such a quantum memory employs controlled reversible inhomogeneous broadening (CRIB) [2,3,4]. Beyond storage, a modified version of CRIB allows quantum state manipulations [5]. CRIB is currently still challenging, however, it is possible to study closely related atom light interaction via stimulated photon echoes [6].\r\nNonorthogonal state discrimination based on POVMs (positive operator valued measure) has become an interesting problem in quantum information processing from a fundamental [7] as well as applied [8] point of view. In this kind of measurement a set of nonorthogonal states is mapped onto a set of orthogonal ones by a non unitary transformation. We propose a novel, robust implementation of POVMs that combines quantum state storage with state rotations and is based on stimulated photon echoes. We will present simulations based on numerically solving Maxwell Bloch equations in an inhomogenously broadened medium, and discuss the experimental results.\r\n\r\n\r\n\r\n[1]H. J. Briegel,Phys. Rev. Lett. 81, 5932(1998)\r\n[2]A. L. Alexander et al, Phys. Rev.Lett.96, 043602(2006)\r\n[3] B. Kraus et al, Phys. Rev. A 73, 020302(2006)\r\n[4] M. Nilsson et al, Opt. Comm. 247, 393 (2005)\r\n[5]M. Underwood et al, in preparation.\r\n[6]M. U. Staudt et al, Phys. Rev. Lett. 98, 113601 (2007)\r\n[7]Y. Sun et al, Phys. Rev A.64, 022311(2001)\r\n[8]V. Scarani et al, Phys. Rev.Lett.92, 057901(2004)\r\n University of Calgary, The University of Calgary | Presentation | 2008-06-10 | A. Delfan, C. La Mela, E. Saglamyurek, W. Tittel | | Combining quantum memory with state manipulation University of Calgary, The University of Calgary | Presentation | 2008-07-02 | A. Delfan, C. La Mela, M. Underwood, K. Marzlin, S. Moiseev, W. Tittel | | Interferometry using photon-echoes for precision measurements and quantum communication University of Calgary, The University of Calgary | Presentation | 2009-07-14 | A. Delfan, E. Saglamyurek, C. La Mela, W. Tittel | | Quantum state manipulation using photon-echo type atom-light interaction University of Calgary, The University of Calgary | Presentation | 2009-10-28 | A. Delfan, E. Saglamyurek, C. La Mela, W. Tittel | | Non-orthogonal state discrimination in a photon echo based optical memory University of Calgary, The University of Calgary | Presentation | 2008-08-21 | C. La Mela, A. Delfan, W. Tittel | | Towards quantum memoryThe implementation of many applications of quantum communication and computation such as quantum repeaters relies on the possibility to reversibly transfer quantum information between photons and atoms. Key properties for such a quantum memory are high recall efficiency and long storage times, and the capacity to store short photonic wavepackets with high fidelity. Our approach towards quantum state storage is based on rare-earth ion doped solid state material (crystalline and amorphous waveguides) at cryogenic temperature, and "controlled reversible inhomogeneous broadening" (CRIB) of a narrow absorption line [1]. Implementation of CRIB relies on the possibility to prepare such an absorption line out of an inhomogeneously broadened medium by means of optical pumping, and to broaden this line in a controlled and reversible way. After an introduction into CRIB, we will present spectroscopic investigations of Thulium doped Lithium Niobate waveguides and silicate fibers, and analyze these novel material candidates in view of the requirements for quantum memory. University of Calgary, The University of Calgary | Presentation | 2008-06-11 | E. Saglamyurek, A. Delfan, N. Sinclair, C. La Mela, W. Tittel | | Quantum memories: storage and state transformation University of Calgary, The University of Calgary | Presentation | 2009-05-11 | C. La Mela, A. Delfan, E. Saglamyurek, W. Tittel | | Photon-echo based N-path interferometers for precision measurements and quantum communicationThe possibility to store and recall information encoded into quantum states of light is at the heart of many applications of quantum information processing, including a quantum repeater [1]. A recently proposed approach to such a quantum memory employs controlled reversible inhomogeneous broadening (CRIB) [2,3,4]. Beyond storage, a modified version of CRIB allows quantum state manipulations [5]. CRIB is currently still challenging, however, it is possible to study closely related atom light interaction via stimulated photon echoes [6]. Nonorthogonal state discrimination based on POVMs (positive operator valued measure) has become an interesting problem in quantum information processing from a fundamental [7] as well as applied [8] point of view. In this kind of measurement a set of nonorthogonal states is mapped onto a set of orthogonal ones by a non unitary transformation. We propose a novel, robust implementation of POVMs that combines quantum state storage with state rotations and is based on stimulated photon echoes. We will present simulations based on numerically solving Maxwell Bloch equations in an inhomogenously broadened medium, and discuss the experimental results.
1. H.J. Briegel, Phys. Rev. Lett. 81, 5932(1998) 2. A.L. Alexander et al, Phys. Rev.Lett. 96, 043602(2006)
3. B. Kraus et al, Phys. Rev. A 73, 020302(2006) 4. M. Nilsson et al, Opt. Comm. 247, 393 (2005) 5. M. Underwood et al, in preparation.
6. M.U. Staudt et al, Phys. Rev. Lett. 98, 113601 (2007)
7. Y. Sun et al, Phys. Rev A.64, 022311(2001) 8. V. Scarani et al, Phys. Rev.Lett.92, 057901(2004)
* This work is being supported by NSERC/General Dynamics Canada/iCORE University of Calgary, The University of Calgary | Presentation | 2009-06-10 | C. La Mela, A. Delfan, E. Saglamyurek, 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 | 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 |
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