Generation of large-amplitude coherent-state superposition via ancilla-assisted photon subtraction.
Generation of large-amplitude coherent-state superposition via ancilla-assisted photon subtraction.
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DOI：
10.1103/physrevlett.101.233605
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发表时间：
2008-06
影响因子：
8.6
通讯作者：
Hiroki Takahashi;K. Wakui;Shigenari Suzuki;M. Takeoka;K. Hayasaka;A. Furusawa;M. Sasaki
中科院分区：
文献类型：
--
作者：
Hiroki Takahashi;K. Wakui;Shigenari Suzuki;M. Takeoka;K. Hayasaka;A. Furusawa;M. Sasaki
我们提出并演示了一种通过辅助辅助光子减法生成大振幅相干态叠加（CSS）的新方法。辅助模式在扩展空间中引起不可区分过程的量子干涉，扩大了条件输出处量子叠加的可控性。我们通过从连续波压缩光中进行简单的时间分离的双光子减法来证明这一点。我们在没有纠正任何缺陷的情况下观察到了迄今为止报道的最大的行进光 CSS，这将使 CSS 状态的各种量子信息应用成为可能。
We propose and demonstrate a novel method to generate a large-amplitude coherent-state superposition (CSS) via ancilla-assisted photon subtraction. The ancillary mode induces quantum interference of indistinguishable processes in an extended space, widening the controllability of quantum superposition at the conditional output. We demonstrate this by a simple time-separated two-photon subtraction from continuous wave squeezed light. We observe the largest CSS of traveling light ever reported without correcting any imperfections, which will enable various quantum information applications with CSS states.