论文标题
单光子散射在量子队上。分散场的时空结构
Single-photon scattering on a qubit. Space-time structure of the scattered field
论文作者
论文摘要
我们研究了通过嵌入1D开波导中的Qubit上的狭窄的单光子高斯脉冲散射引起的散射场的时空结构。对于弱激发能力，我们获得了反射和传输场的空间和时间依赖性的显式分析表达式，通常与普通的行进波不同。分散的场由两个部分组成：一个阻尼部分，代表激发量子的自发衰变和连贯的，无损的部分。我们表明，对于从Qubit的大距离$ x $，有时在散射事件发生后很长一段时间内，我们的理论提供了固定光子传输中众所周知的结果。但是，固定极限的方法非常慢。随着$ x $和$ t $的逆权差，零散的场均减小，因为与量子的距离和互动增加后的时间。
We study the space-time structure of the scattered field induced by the scattering of a narrow single-photon Gaussian pulse on a qubit embedded in 1D open waveguide. For a weak excitation power we obtain explicit analytical expressions for space and time dependence of reflected and transmitted fields which are, in general, are different from plain travelling waves. The scattered field consists of two parts: a damping part which represent a spontaneous decay of the excited qubit and a coherent, lossless part. We show that for large distance $x$ from qubit and at times $t$ long after the scattering event our theory provides the result which is well known from the stationary photon transport. However, the approach to the stationary limit is very slow. The scattered field decreases as the inverse powers of $x$ and $t$ as both the distance from the qubit and the time after the interaction increase.
