High-fidelity polarization storage in a gigahertz bandwidth quantum memory
High-fidelity polarization storage in a gigahertz bandwidth quantum memory
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DOI：
10.1088/0953-4075/45/12/124008
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发表时间：
2012-06-28
影响因子：
1.6
通讯作者：
Walmsley, I. A.
中科院分区：
文献类型：
--
作者：
England, D. G.;Michelberger, P. S.;Walmsley, I. A.
我们展示了偏振干涉仪内部的双轨道光学拉曼存储器；这使我们能够在室温原子系综中以GHz带宽存储极化编码信息。通过对系统进行全过程断层扫描，我们测量了存储和检索过程高达97 +/- 1%的过程保真度。在较长的存储时间，过程保真度保持高，尽管效率的损失。存储时间为1.5 μ s，是脉冲持续时间的5000倍，保真度为86±4%。因此，高保真度与大时间带宽产品相结合。这种高性能，实验上简单的设置，证明了拉曼存储器集成到大规模量子网络中的适用性。
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.