论文标题
一个原子在自由空间中发出的光的强量子相关性
Strong quantum correlations of light emitted by a single atom in free space
论文作者
论文摘要
我们提出了一种新型方法，可以设计出从一个自由空间中单个原子分散的输入场和场之间的干扰中出现的光子相关性。名义上，效率低下的原子光耦合导致量子相关性仅由输入场主导。为了克服这个问题，我们提出了使用单独的泵和探针梁的使用，其中前者会增加原子发射以与探针相当。检查二阶相关函数$ g^{（2）}（τ）在探针方向上的$，我们发现泵的添加与提高耦合效率的作用正式起着相同的作用。我们表明，可以通过适当的选择泵振幅调整相关函数$ g^{（2）}（2）}（0）$，从零（完美的反堆）到Infinite（Extreme Bunching），通过适当的泵振幅选择。我们进一步阐明了这些相关性在检测光子后的瞬态原子状态方面的起源。
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.
