利用连续变量量子信息扩展望远镜基线的实用方法
Practical Approach to Extending Baselines of Telescopes using Continuous-Variable Quantum Information
AI总结：
针对干涉望远镜光损耗限制基线长度的问题，提出基于双模压缩真空态与零差检测的连续变量纠缠辅助方案，经Fisher信息分析其性能未超越传统方案与GJC12方案。
摘要：
干涉望远镜对遥远天体成像至关重要，但光损耗严重限制了阵列中望远镜之间的可放置距离，成为可实现分辨率的瓶颈。Gottesman、Jennewein和Croke（GJC12）[《物理评论快报》，109(7):070503，2011年7月]提出了一种纠缠辅助方案，若能通过量子中继器网络长距离分发纠缠态，该方案有望解决光损耗问题。本文提出另一种纠缠辅助方案：将双模压缩真空态与天体信号态发生干涉，再通过零差检测测量所得态。我们采用连续变量方法，计算了关于天体源互相干性的Fisher信息。研究表明，若以成功测量的速率累积观测Fisher信息，本文提出的方案性能未超越传统直接检测方案，也未超越GJC12的纠缠辅助方案。
英文摘要：
Interferometric telescopes are instrumental for the imaging of distant astronomical bodies, but optical loss heavily restricts how far telescopes in an array can be placed from one another, leading to a bottleneck in the resolution that can be achieved. An entanglement-assisted approach to this problem has been proposed by Gottesman, Jennewein, and Croke (GJC12) [Physical Review Letters, 109(7):070503, July 2011], as a possible solution to the issue of optical loss if the entangled state can be distributed across long distances by employing a quantum repeater network. In this paper, we propose an alternative entanglement-assisted scheme that interferes a two-mode squeezed vacuum state with the astronomical state and then measures the resulting state by means of homodyne detection. We use a continuous-variable approach and compute the Fisher information with respect to the mutual coherence of the astronomical source. We show that when the Fisher information is observed cumulatively at the rate at which successful measurements can be performed, our proposed scheme does not outperforms the traditional direct detection approach or the entanglement-assisted approach of GJC12.
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