Distributed entanglement generation between continuous-mode Gaussian fields with measurement-feedback enhancement
Distributed entanglement generation between continuous-mode Gaussian fields with measurement-feedback enhancement
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DOI：
10.1103/physreva.86.022337
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发表时间：
2012-08
影响因子：
2.9
通讯作者：
H. Nurdin;N. Yamamoto
中科院分区：
文献类型：
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作者：
H. Nurdin;N. Yamamoto
本文研究了两个空间上相距很远的振子系统通过高斯场连接的方案，并研究了两个连续模输出的高斯场在振子辐射下的分布式纠缠产生。结果表明，在非局域有效纠缠操作下，采用测量反馈控制可以增强输出光场之间的类爱因斯坦-波多尔斯基-罗森（EPR）纠缠.传播延迟和损失的影响，在两个振荡器互连的领域，以及系统中的其他损失的影响，也被认为是。特别地，对于一定范围的时间延迟，测量反馈控制器能够保持闭环系统的稳定性和纠缠增强，但可实现的增强仅在与时间延迟的长度相称的较小带宽上。
This paper studies a scheme of two spatially distant oscillator systems that are connected by Gaussian fields and examines distributed entanglement generation between two continuous-mode output Gaussian fields that are radiated by the oscillators. It is demonstrated that using measurement-feedback control while a non-local effective entangling operation is on can help to enhance the Einstein-Podolski-Rosen (EPR)-like entanglement between the output fields. The effect of propagation delays and losses in the fields interconnecting the two oscillators, and the effect of other losses in the system, are also considered. In particular, for a range of time delays the measurement feedback controller is able to maintain stability of the closed-loop system and the entanglement enhancement, but the achievable enhancement is only over a smaller bandwidth that is commensurate with the length of the time delays.