Revival of Silenced Echo and Quantum Memory for Light

Details Revival of Silenced Echo and Quantum Memory for Light Revival of Silenced Echo and Quantum Memory for Light

2011-04-26

arxiv.org/abs/1104.4875v1

New Journal of Physics, Volume 13, 093031, September 2011

Physics

Quantum Physics

13 pages, 6 figures

Scientific paper

10.1088/1367-2630/13/9/093031

We propose an original quantum memory protocol. It belongs to the class of rephasing processes and is closely related to two-pulse photon echo. It is known that the strong population inversion produced by the rephasing pulse prevents the plain two-pulse photon echo from serving as a quantum memory scheme. Indeed gain and spontaneous emission generate prohibitive noise. A second $\pi$-pulse can be used to simultaneously reverse the atomic phase and bring the atoms back into the ground state. Then a secondary echo is radiated from a non-inverted medium, avoiding contamination by gain and spontaneous emission noise. However, one must kill the primary echo, in order to preserve all the information for the secondary signal. In the present work, spatial phase mismatching is used to silence the standard two-pulse echo. An experimental demonstration is presented.

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