Highly efficient optical quantum memory with long coherence time in cold atoms
- Highly efficient optical quantum memory with long coherence time in cold atoms
- 조영욱; G.T. Campbell; J.L. Everett; J. Bernu; D.B. Higginbottom; M.T. Cao; J. Geng; N.P. Robins; P.K. Lam; B.C. Buchler
- Issue Date
- VOL 3, NO 1-107
- Optical quantum memory is an essential element for long-distance quantum communication and photonic quantum computation protocols. The practical implementation of such protocols requires an efficient quantum memory with a long coherence time. Beating the no-cloning limit, for example, requires efficiencies above 50%. An ideal optical fiber loop has a loss of 50% in 100 mu s, and until now no universal quantum memory has beaten this time efficiency limit. Here, we report results of a gradient echo memory experiment in a cold atomic ensemble with a 1/e coherence time up to 1 ms and maximum efficiency up to 87% +/- 2% for short storage times. Our experimental data demonstrate greater than 50% efficiency for storage times up to 0.6 ms. Quantum storage ability is verified beyond the ideal fiber limit using heterodyne tomography of small coherent states.
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