Quantum-state transfer between tripod atoms over a dark fiber
Quantum-state transfer between tripod atoms over a dark fiber
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DOI：
10.1103/physreva.88.033817
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发表时间：
2013-09
影响因子：
2.9
通讯作者：
G. Bevilacqua;F. Renzoni
中科院分区：
文献类型：
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作者：
G. Bevilacqua;F. Renzoni
在这项工作中，我们介绍了一个模型的三脚架原子之间的量子态转移在暗光纤。两个三脚架原子被限制在由光纤连接的单独腔中。腔和光纤维持相反圆偏振的两个光学模式。对于每个原子，两个基态编码要转移的量子态，并通过相反偏振的腔模耦合到一个共同的激发态。每个原子的剩余跃迁用于控制转移过程。我们证明，通过使用激光脉冲的系统的动力学可以被限制在一个退化的暗态子空间，与不同的暗态通过非绝热耦合相互作用。我们解析地求解了暗态子空间中的动力学，确定了实现量子转移的脉冲形状条件。我们确定了一个可能的脉冲形状，满足所需的条件，并通过数值模拟证明了量子态转移。
In this work we introduce a model for quantum-state transfer between tripod atoms over a dark fiber. Two tripod atoms are confined in separate cavities linked by an optical fiber. The cavities and the fiber sustain two optical modes of opposite circular polarization. For each atom, the two ground states encode the quantum state to be transferred and are coupled to a common excited state by the cavity modes of opposite polarization. The remaining transition for each atom is used to control the transfer process. We demonstrate that by using laser pulses the dynamics of the system can be confined within a degenerate dark state subspace, with the different dark states interacting via nonadiabatic couplings. We solve analytically the dynamics in the dark state subspace, and determine the conditions on the pulse shape for the implementation of the quantum transfer. We identify a possible pulse shape which satisfies the required conditions, and demonstrate the quantum-state transfer via numerical simulations.