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arXiv quant-ph/0612198quant-ph
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介观双光束中的子散粒噪声光子数关联

Sub-shot-noise photon-number correlation in mesoscopic twin-beam of light

Maria Bondani, Alessia Allevi, Guido Zambra, Matteo G. A. Paris, Alessandra Andreoni

摘要:

我们证明了亚散粒噪声光子数的相关性在(时间)多模介观($\sim 10^3$检测到的光子)双光束产生的ps脉冲自发非简并参数下转换。我们分别检测了在孪生相干区收集的光子的信号和闲频分布,发现光子计数差的方差低于散粒噪声极限3.25 dB。双光束中包含的时间模式的数量以及双相干区域的大小取决于泵浦强度。我们的方案是基于自发下转换,因此不会受到限制,由于有限增益的参数过程。双光束也被用来证明一个非经典(亚泊松)状态的条件准备。

英文摘要:

We demonstrate sub-shot-noise photon-number correlations in a (temporal) multimode mesoscopic ($\sim 10^3$ detected photons) twin-beam produced by ps-pulsed spontaneous non-degenerate parametric downconversion. We have separately detected the signal and idler distributions of photons collected in twin coherence areas and found that the variance of the photon-count difference goes below the shot-noise limit by 3.25 dB. The number of temporal modes contained in the twin-beam, as well as the size of the twin coherence areas, depends on the pump intensity. Our scheme is based on spontaneous downconversion and thus does not suffer from limitations due to the finite gain of the parametric process. Twin-beams are also used to demonstrate the conditional preparation of a nonclassical (sub-Poissonian) state.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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