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arXiv 1607.05413quant-ph
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耦合腔阵列中三重单态的量子反馈耗散制备

Dissipative preparation of tripartite singlet state in coupled arrays of cavities via quantum feedback control

X. Q. Shao, Z. H. Wang, H. D. Liu, X. X. Yi

摘要:

提出了一种实验上可行的方案,利用耗散方法制备了三个耦合腔阵列中原子的三重纠缠态。相干驱动场和基于量子跳跃的反馈控制的组合将驱动系统进入非平衡稳态,该非平衡稳态与真正的三原子单重态具有几乎完美的重叠。研究了不同的控制策略,确定了相应的最优参数。此外,靶态的保真度对探测效率不敏感,在单原子合作性参数$C\equiv g^2/(γκ)>350$等较宽的退相干参数范围内,其保真度均超过90%.

英文摘要:

We propose an experimentally feasible scheme for dissipative preparation of tripartite entangled state with atoms separately trapped in an array of three coupled cavities. The combination of coherent driving fields and quantum-jump-based feedback control will drive the system into a non-equilibrium steady state, which has a nearly perfect overlap with the genuine three-atom singlet state. Different control strategies are investigated and the corresponding optimal parameters are confirmed. Moreover, the fidelity of target state is insensitive to detection inefficiencies, and it oversteps 90\% for a wide range of decoherence parameters as long as the single-atom cooperativity parameter $C\equiv g^2/(γκ)>350$.

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