Rephasing processes and quantum memory for light: reversibility issues and how to fix them

Details Rephasing processes and quantum memory for light: reversibility issues and how to fix them Rephasing processes and quantum memory for light: reversibility issues and how to fix them

2011-08-31

arxiv.org/abs/1108.6169v1

Physics

Quantum Physics

8 pages, 6 figures, was presented in 20th International Laser Physics Workshop (LPHYS'11), July 11-15, 2011, Sarajevo, Bosnia

Scientific paper

Time reversibility is absent from some recently proposed quantum memory protocols such as Absorption Frequency Comb (AFC). Focusing on AFC memory, we show that quantum efficiency and fidelity are reduced dramatically, as a consequence of non-reversibility, when the spectral width of the incoming signal approaches the memory bandwidth. Non-reversibility is revealed through spectral dispersion, giving rise to phase mismatching. We propose a modified AFC scheme that restores reversibility. This way, signals can be retrieved with excellent efficiency over the entire memory bandwidth. This study could be extended to other quantum memory rephasing schemes in inhomogeneously broadened absorbing media.

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