Highly efficient optical quantum memory with long coherence time in cold atoms

被引：151

作者：

Cho, Y-W ^{[1
]}

Campbell, G. T. ^{[1
]}

Everett, J. L. ^{[1
]}

Bernu, J. ^{[1
]}

Higginbottom, D. B. ^{[1
]}

Cao, M. T. ^{[1
]}

Geng, J. ^{[1
]}

Robins, N. P. ^{[2
]}

Lam, P. K. ^{[1
]}

Buchler, B. C. ^{[1
]}

机构：

[1] Australian Natl Univ, Dept Quantum Sci, Ctr Quantum Computat & Commun Technol, GPO Box 4, Canberra, ACT 0200, Australia

[2] Australian Natl Univ, Dept Quantum Sci, GPO Box 4, Canberra, ACT 0200, Australia

来源：

OPTICA | 2016年 / 3卷 / 01期

基金：

澳大利亚研究理事会; 新加坡国家研究基金会;

关键词：

SINGLE-PHOTON-LEVEL; TELECOM-WAVELENGTH; STORAGE;

D O I：

10.1364/OPTICA.3.000100

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

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. (C) 2016 Optical Society of America

引用

页码：100 / 107

页数：8

共 57 条

[1] A waveguide frequency converter connecting rubidium-based quantum memories to the telecom C-band [J].