物理
光子
分束器
相干态
真空状态
量子力学
量子态
福克州
量子光学
压缩相干态
光学
国家(计算机科学)
量子
激光器
数学
算法
作者
Mohammed Dakna,L. Knöll,D.‐G. Welsch
标识
DOI:10.1016/s0030-4018(97)00463-x
摘要
We show that conditional output measurement on a beam splitter may be used to produce photon-added states for a large class of signal-mode quantum states, such as thermal states, coherent states, squeezed states, and displaced photon-number states. Combining a mode prepared in such a state and a mode prepared in a photon-number state, the state of the mode in one of the output channels of the beam splitter “collapses” to a photon-added state, provided that no photons are detected in the other output channel. We present analytical and numerical results, with special emphasis on photon-added coherent and squeezed vacuum states. In particular, we show that adding photons to a squeezed vacuum yields Schrödinger-cat-like states in terms of superpositions of non-Gaussian squeezed coherent states. We finally show that the quantum features of the conditional output states are observed even when the reference mode is prepared in a sub-Poissonian statistical mixture of photon-number states.
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