| Characterization of a high efficiency optical memory for the storage of quantum light statesWe have developed a coherent optical storage device based on a Gradient Echo Memory scheme showing efficiencies of above 65\%. The memory is realized in a warm vapor of 87Rb atoms utilizing a Λ-type energy level scheme. We use a co-propagating, co-rotating circular polarized pump beam coupled with pulsed coherent states to create an off-resonant Raman absorption line suitable for storage. Through sufficient filtration of the strong pump field, the stored light pulse is retrieved after a desired time and subjected to time-domain homodyne tomography. By repeating this sequence on an ensemble of 50 000 identical coherent states we gain enough information to completely reconstruct the quantum state of light retrieved from the memory. Furthermore, by repeating this characterization for a set of coherent states with at sufficient range of amplitudes we can completely characterize the memory process itself. This is possible by implementing a method devised by our group called coherent state Quantum Process Tomography which also has the capability to predict how well the memory will perform on any arbitrary quantum input state. We show our current storage efficiencies and what needs to be further done to demonstrate a true high efficiency, quantum optical memory. University of Calgary | Presentation | 2012-06-07 | C. Kupchak, R. Thomas, A. Lvovsky |
| Characterization of high efficiency quantum memory University of Calgary | Presentation | 2012-06-14 | C. Kupchak, R. Thomas, A. Lvovsky |
| Evanescent EIT and Goos-Hanchen shifts University of Calgary | Presentation | 2012-05-24 | C. Kupchak, R. Thomas, A. Lvovsky |
| Characterization of a high efficiency optical memory for the storage of quantum light states University of Calgary | Presentation | 2012-07-25 | C. Kupchak, R. Thomas, A. Lvovsky |
| Memory for Light as a Quantum Process University of Calgary | Publication | 2009-05-01 | M. Lobino, C. Kupchak, E. Figueroa, A. Lvovsky |
| Observation of electromagnetically induced transparency in evanescent fields University of Calgary | Publication | 2013-01-01 | R. Thomas, C. Kupchak, G. S. Agarwal, A. Lvovsky |
| A peek into a quantum black box University of Calgary | Presentation | 2009-07-08 | M. Lobino, C. Kupchak, E. Figueroa, J. Appel, A. Lvovsky |
| Electromagnetically induced transparency using evanescent fields in warm atomic vapour University of Calgary | Presentation | 2012-07-23 | R. Thomas, C. Kupchak, A. G. Agarwal, A. Lvovsky |
| Process tomography of quantum-optical memory University of Calgary | Presentation | 2009-01-05 | M. Lobino, C. Kupchak, E. Figueroa, A. Lvovsky |
| Do we need quantum light to test quantum memory? University of Calgary | Presentation | 2009-06-10 | M. Lobino, C. Kupchak, E. Figueroa, J. Appel, A. Lvovsky |
| Coherent-state quantum process tomography University of Calgary | Presentation | 2010-08-05 | M. Lobino, C. Kupchak, R. Kumar, E. Barrios, A. Hendriks, E. Figueroa, A. Lvovsky |
| Electromagnetically induced transparency with evanescent fields University of Calgary | Presentation | 2012-07-25 | R. Thomas, C. Kupchak, A. G. Agarwal, A. Lvovsky |
| Electromagnetically induced transparency with evanescent optical fields University of Calgary | Presentation | 2012-06-12 | R. Thomas, C. Kupchak, A. G. Agarwal, A. Lvovsky |
| Experimental Characterization of Bosonic Creation and Annihilation Operators University of Calgary | Publication | 2013-03-01 | R. Kumar, E. Barrios, C. Kupchak, A. Lvovsky |
| Electromagnetically-induced transparency and squeezed light University of Calgary | Publication | 2009-01-01 | E. Figueroa, J. Appel, C. Kupchak, M. Lobino, D. Korystov, A. Lvovsky |
| Quantum-optical process tomography using coherent states University of Calgary | Presentation | 2010-07-19 | M. Lobino, D. Korystov, C. Kupchak, E. Figueroa, R. Kumar, E. Barrios, S. Rahimi-Keshari, A. Scherer, B. C. Sanders, A. Lvovsky |
| Electromagnetically-induced transparency and squeezed light University of Calgary | Publication | 2009-05-01 | E. Figueroa, J. Appel, C. Kupchak, M. Lobino, D. Korystov |
| A continuous-variable approach to process tomographyWe propose and demonstrate experimentally a technique for estimating quantum-optical processes in the continuous-variable domain. The process data is determined by applying the process to a set of coherent states and measuring the output. The process output for an arbitrary input state can then be obtained from its Glauber-Sudarshan expansion. Although such expansion is generally singular, it can be arbitrarily well approximated with a regular function. University of Calgary | Presentation | 2008-08-26 | M. Lobino, E. Figueroa, D. Korystov, C. Kupchak, B. C. Sanders, A. Lvovsky |
| Electromagnetically-induced transparency and squeezed light University of Calgary | Presentation | 2008-08-20 | E. Figueroa, J. Appel, D. Korystov, M. Lobino, C. Kupchak, A. Lvovsky |
