Two-axis-twisting spin squeezing by multipass quantum erasure

Two-axis-twisting spin squeezing by multipass quantum erasure
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多通道量子擦除的两轴扭曲自旋挤压

DOI:
10.1103/physreva.96.013823
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发表时间:
2015-02
期刊:
影响因子:
2.9
通讯作者:
Yanhong Xiao
Yanhong Xiao
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Mingfeng Wang;Weizhi Qu;Pengxiong Li;Han Bao;Vladan Vuletic;Yanhong Xiao

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多体纠缠态是量子信息科学和量子计量学中的重要组成部分。利用光学技术建立高度多体纠缠的一个重要问题是通过产生这种纠缠的光泄漏系统信息。我们提出了一种基于全光干涉的方法来擦除这些信息。不需要的原子-光纠缠可以通过三个或更多个连续的原子-光相互作用的相消干涉来去除,只留下所需的有效原子-原子相互作用。这种量子擦除协议允许使用相干光和冷或热原子系综实现海森堡限制的自旋压缩。计算结果表明,与以前的方法相比,该方法能显著改善压缩超过10 dB的情况,并且在适当的实验条件下也能实现较大的自旋压缩.我们的方法能够以简单的设置有效地创建多体纠缠态,因此有希望推进量子计量学和量子信息处理技术。
Many-body entangled states are key elements in quantum information science and quantum metrology. One important problem in establishing a high degree of many-body entanglement using optical techniques is the leakage of the system information via the light that creates such entanglement. We propose an all-optical interference-based approach to erase this information. Unwanted atom-light entanglement can be removed by destructive interference of three or more successive atom-light interactions, with only the desired effective atom-atom interaction left. This quantum erasure protocol allows implementation of Heisenberg-limited spin squeezing using coherent light and a cold or warm atomic ensemble. Calculations show that significant improvement in the squeezing exceeding 10 dB is obtained compared to previous methods, and substantial spin squeezing is attainable even under moderate experimental conditions. Our method enables the efficient creation of many-body entangled states with simple setups, and thus is promising for advancing technologies in quantum metrology and quantum information processing.
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