Hannover 2010 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 59: Quantum Information: Atoms and Ions IV / Photons and Nonclassical Light II
Q 59.1: Vortrag
Freitag, 12. März 2010, 10:30–10:45, E 214
Storage and recall of single photon level pulses with an efficiency of 25% — •Andreas Walther, Mahmood Sabooni, Felix Beaudoin, Lin Nan, Atia Amari, Maomao Huang, and Stefan Kröll — Department of Physics, Lund University, P.O. Box 118, SE-22100 Lund, Sweden
We demonstrate experimentally a quantum memory scheme for the storage of weak coherent light pulses in an inhomogeneously broadened optical transition in a Pr3+: 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.