Efficient quantum memory and entanglement between light and an atomic ensemble using magnetic fields
Efficient quantum memory and entanglement between light and an atomic ensemble using magnetic fields
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DOI：
10.1103/physreva.73.062329
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发表时间：
2005-12
影响因子：
2.9
通讯作者：
C. Muschik;K. Hammerer;E. Polzik;J. Cirac
中科院分区：
文献类型：
--
作者：
C. Muschik;K. Hammerer;E. Polzik;J. Cirac
我们提出了两个协议，一个用于在原子系综中存储光并随后检索，另一个用于产生光与原子之间的纠缠。它们依赖于单个脉冲通过系综的两次通过，拉莫尔在外场中进动。这两种协议都是确定性工作的，相关的品质因数（如保真度或EPR方差）在耦合强度中呈指数级变化。我们解决相应的麦克斯韦-布洛赫方程描述的散射过程，并确定所产生的输入输出关系，其中只涉及一个相关的光模式，反过来，可以很容易地访问实验。
We present two protocols, one for the storage of light in an atomic ensemble and the subsequent retrieval, and another one for the generation of entanglement between light and atoms. They rely on two passes of a single pulse through the ensemble, Larmor precessing in an external field. Both protocols work deterministically and the relevant figures of merit--such as the fidelity or the EPR variance--scale exponentially in the coupling strength. We solve the corresponding Maxwell-Bloch equations describing the scattering process and determine the resulting input-output relations which only involve one relevant light mode that, in turn, can be easily accessed experimentally.