Storage and recall of weak coherent optical pulses with an efficiency of 25%

Details Storage and recall of weak coherent optical pulses with an efficiency of 25% Storage and recall of weak coherent optical pulses with an efficiency of 25%

2009-12-14

arxiv.org/abs/0912.2525v1

Physics

Quantum Physics

5,4

Scientific paper

We demonstrate experimentally a quantum memory scheme for the storage of weak coherent light pulses in an inhomogeneously broadened optical transition in a Pr^{3+}: YSO crystal at 2.1 K. Precise optical pumping using a frequency stable (about 1kHz linewidth) laser is employed to create a highly controllable Atomic Frequency Comb (AFC) structure. We report single photon storage and retrieval efficiencies of 25%, based on coherent photon echo type re-emission in the forward direction. The coherence property of the quantum memory is proved through interference between a super Gaussian pulse and the emitted echo. Backward retrieval of the photon echo emission has potential for increasing storage and recall efficiency.

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