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arXiv 2004.01993quant-ph
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自由空间中单原子发射光的强量子关联

Strong quantum correlations of light emitted by a single atom in free space

Daniel Goncalves, Morgan W. Mitchell, Darrick E. Chang

摘要:

本文提出了一种新的方法来设计由输入光场和自由空间中单个原子散射光场之间的干涉产生的光子关联。名义上,低效率的原子-光耦合导致量子关联仅由输入场主导。为了克服这个问题,我们建议使用单独的泵浦和探测光束,其中前者增加了原子发射,以与探测相媲美。研究了探测方向上总场的二阶关联函数$g^{(2)}(τ)$,发现泵浦的加入在形式上起到了与提高耦合效率相同的作用。我们表明,可以调整的关联函数$g^{(2)}(0)$从零(完美的反聚束)到无限(极端聚束)通过适当的选择泵浦幅度。我们进一步阐明了这些相关性的起源,在瞬态原子状态的检测光子。

英文摘要:

We present a novel approach to engineer the photon correlations emerging from the interference between an input field and the field scattered by a single atom in free space. Nominally, the inefficient atom-light coupling causes the quantum correlations to be dominated by the input field alone. To overcome this issue, we propose the use of separate pump and probe beams, where the former increases the atomic emission to be comparable to the probe. Examining the second-order correlation function $g^{(2)}(τ)$ of the total field in the probe direction, we find that the addition of the pump formally plays the same role as increasing the coupling efficiency. We show that one can tune the correlation function $g^{(2)}(0)$ from zero (perfect anti-bunching) to infinite (extreme bunching) by a proper choice of pump amplitude. We further elucidate the origin of these correlations in terms of the transient atomic state following the detection of a photon.

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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