High-fidelity polarization storage in a gigahertz bandwidth quantum memory

被引：39

作者：

England, D. G. ^{[1
]}

Michelberger, P. S. ^{[1
]}

Champion, T. F. M. ^{[1
]}

Reim, K. F. ^{[1
]}

Lee, K. C. ^{[1
]}

Sprague, M. R. ^{[1
]}

Jin, X-M ^{[1
,2
]}

Langford, N. K. ^{[1
]}

Kolthammer, Ws ^{[1
]}

Nunn, J. ^{[1
]}

Walmsley, I. A. ^{[1
]}

机构：

[1] Univ Oxford, Dept Phys, Clarendon Lab, Oxford OX1 3PU, England

[2] Natl Univ Singapore, Ctr Quantum Technol, Singapore 117543, Singapore

来源：

JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS | 2012年 / 45卷 / 12期

基金：

英国工程与自然科学研究理事会;

关键词：

ENTANGLEMENT;

D O I：

10.1088/0953-4075/45/12/124008

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We demonstrate a dual-rail optical Raman memory inside a polarization interferometer; this enables us to store polarization-encoded information at GHz bandwidths in a room-temperature atomic ensemble. By performing full process tomography on the system, we measure up to 97 +/- 1% process fidelity for the storage and retrieval process. At longer storage times, the process fidelity remains high, despite a loss of efficiency. The fidelity is 86 +/- 4% for 1.5 mu s storage time, which is 5000 times the pulse duration. Hence, high fidelity is combined with a large time-bandwidth product. This high performance, with an experimentally simple setup, demonstrates the suitability of the Raman memory for integration into large-scale quantum networks.

引用

页数：6

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