Entanglement of a photon and a collective atomic excitation -: art. no. 040405
Entanglement of a photon and a collective atomic excitation -: art. no. 040405
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DOI：
10.1103/physrevlett.95.040405
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发表时间：
2005-07-22
影响因子：
8.6
通讯作者：
Kuzmich, A
中科院分区：
文献类型：
--
作者：
Matsukevich, DN;Chanelière, T;Kuzmich, A
我们描述了一种新的概率原子光子（信号）纠缠的实验方法。两个量子位态被编码为一个非极化原子系综的正交集体自旋激发。经过一段可编程延迟后，原子激发转换为光子（闲散）。记录了信号和惰轮的偏振态，发现它们都符合贝尔不等式。原子相干时间超过几微秒是通过关闭所有的捕获场（包括磁光捕获的四极磁场）和将剩余的环境磁场归零来实现的。
We describe a new experimental approach to probabilistic atom-photon (signal) entanglement. Two qubit states are encoded as orthogonal collective spin excitations of an unpolarized atomic ensemble. After a programmable delay, the atomic excitation is converted into a photon (idler). Polarization states of both the signal and the idler are recorded and are found to be in violation of the Bell inequality. Atomic coherence times exceeding several microseconds are achieved by switching off all the trapping fields-including the quadrupole magnetic field of the magneto-optical trap-and zeroing out the residual ambient magnetic field.