Abstract
Quantum memory is essential for the development of many devices in quantum information processing, including a synchronization tool that matches various processes within a quantum computer, an identity quantum gate that leaves any state unchanged, and a mechanism to convert heralded photons to on-demand photons. In addition to quantum computing, quantum memory will be instrumental for implementing long-distance quantum communication using quantum repeaters. The importance of this basic quantum gate is exemplified by the multitude of optical quantum memory mechanisms being studied, such as optical delay lines, cavities and electromagnetically induced transparency, as well as schemes that rely on photon echoes and the off-resonant Faraday interaction. Here, we report on state-of-the-art developments in the field of optical quantum memory, establish criteria for successful quantum memory and detail current performance levels.
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Acknowledgements
This work was supported by iCORE, QuantumWorks, NSERC, CFI and GDC. A.I.L. is a CIFAR Scholar and B.C.S. is a CIFAR Associate.
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Lvovsky, A., Sanders, B. & Tittel, W. Optical quantum memory. Nature Photon 3, 706–714 (2009). https://doi.org/10.1038/nphoton.2009.231
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DOI: https://doi.org/10.1038/nphoton.2009.231
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