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arXiv 1402.3872quant-ph
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三重原子-光力学系统的非定域性和纠缠度

More nonlocality with less entanglement in a tripartite atom-optomechanical system

Jing Zhang, Tiancai Zhang, André Xuereb, David Vitali, Jie Li

摘要:

本文研究了由原子云和移动镜组成的单模腔系统中的混合原子光学力学中的量子效应。在原子-光-镜系统中观察到了三分非局域性,这一点可以通过破坏Mermin-Klyshko(MK)不等式来证明。它已被证明[C。Genes等人,PRA 77,050307(R)(2008)],当腔与驱动激光器的反斯托克斯边带谐振并且原子频率与斯托克斯频率匹配时,三重纠缠被优化。然而,我们表明,这是不是非局部性的情况下。当原子与Stokes边带和反Stokes边带都共振时,MK函数达到{ \it minima},出乎意料的是,我们发现只有在纠缠远未达到最大值的参数区域才违反MK不等式.考虑到在破坏MK不等式的情况下可能出现二体非局域性,非局域性与纠缠之间存在着负的关系。我们还研究了非经典的镜子后选择的测量,例如盖革类检测,对腔和/或原子。我们证明了在合适的参数下,对原子进行类盖革探测可以有效地诱导出力学非经典性。

英文摘要:

We study quantum effects in hybrid atomic optomechanics in a system comprising a cloud of atoms and a mobile mirror mediated by a single-mode cavity. Tripartite nonlocality is observed in the atom-light-mirror system, as demonstrated by the violation of the Mermin-Klyshko (MK) inequality. It has been shown [C. Genes, et al., PRA 77, 050307 (R) (2008)] that tripartite entanglement is optimized when the cavity is resonant with the anti-Stokes sideband of the driving laser and the atomic frequency matches the Stokes one. However, we show that this is not the case for the nonlocality. The MK function achieves {\it minima} when the atoms are resonant with both the Stokes and anti-Stokes sidebands, and unexpectedly, we find violation of the MK inequality only in a parameter region where entanglement is far from being maximum. A negative relation exists between nonlocality and entanglement with consideration of the possibility of bipartite nonlocality in the violation of the MK inequality. We also study the non-classicality of the mirror by post-selected measurements, e.g. Geiger-like detection, on the cavity and/or the atoms. We show that with feasible parameters Geiger-like detection on the atoms can effectively induce mechanical non-classicality.

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