Production of superpositions of coherent states in traveling optical fields with inefficient photon detection
Production of superpositions of coherent states in traveling optical fields with inefficient photon detection
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DOI：
10.1103/physreva.72.013801
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发表时间：
2004-10
影响因子：
2.9
通讯作者：
H. Jeong;A. Lund;T. Ralph
中科院分区：
文献类型：
--
作者：
H. Jeong;A. Lund;T. Ralph
我们发展了一个全光方案，在行波光场中产生宏观可分辨相干态的叠加态。它非确定性地提取相干态叠加（CSS的）与大振幅的CSS的小振幅使用效率低下的光子检测。产生具有更大振幅的CSS所需的小CSS非常好地近似于压缩单光子。我们讨论了该方案的一些显著特点：它有效地净化了低效单光子源发射的混合初态，并提高了量子态的Wigner函数的负性。
We develop an all-optical scheme to generate superpositions of macroscopically distinguishable coherent states in traveling optical fields. It nondeterministically distills coherent-state superpositions (CSS's) with large amplitudes out of CSS's with small amplitudes using inefficient photon detection. The small CSS's required to produce CSS's with larger amplitudes are extremely well approximated by squeezed single photons. We discuss some remarkable features of this scheme: it effectively purifies mixed initial states emitted from inefficient single-photon sources and boosts negativity of Wigner functions of quantum states.