论文标题
电路量子电动力学中两个Q量系统的超级发射光谱
Superradiant emission spectra of a two-qubit system in circuit quantum electrodynamics
论文作者
论文摘要
在本文中，我们研究了最简单的原子系统的自发发射光谱和表现出亚和超级性质的发射速率：一个由两个人工原子（超导量子）组成的系统，该系统嵌入了一维开放的波导中。该计算基于过渡算子的方法，该方法首先由R. H. Lehmberg引入理论上描述了自由空间中两级原子的自发发射。我们获得了光子辐射光谱的显式表达式，并获得了不同初始两分配置的发射速率，并具有一种和两种激发。对于每个初始状态，我们都会计算辐射光谱和量子位之间不同有效距离的发射衰减速率。在每种情况下，将衰减率与单个量子衰减进行比较，以显示具有给定初始状态的两数Qubit衰变的超级或子负性性质。
In this paper we study the spontaneous emission spectra and the emission decay rates of a simplest atom system that exhibits sub- and superradiant properties: a system which consists of two artificial atoms (superconducting qubits) embedded in a one-dimensional open waveguide. The calculations are based on the method of the transition operator which was firstly introduced by R. H. Lehmberg to theoretically describe the spontaneous emission of two-level atoms in a free space. We obtain the explicit expressions for the photon radiation spectra and the emission decay rates for different initial two-qubit configurations with one and two excitations. For every initial state we calculate the radiation spectra and the emission decay rates for different effective distances between qubits. In every case, a decay rate is compared with a single qubit decay to show the superradiant or subradiant nature of a two-qubit decay with a given initial state.
