Superradiance transition in a system with a single qubit and a single oscillator
Superradiance transition in a system with a single qubit and a single oscillator
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DOI：
10.1103/physreva.87.013826
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发表时间：
2013-01-23
影响因子：
2.9
通讯作者：
Ashhab, S.
中科院分区：
文献类型：
--
作者：
Ashhab, S.
我们考虑包含一个二能级系统或量子比特和一个单谐振子的Rabi模型中的类相变行为。随着量子比特-振子耦合强度的变化和超过临界点的增加，系统经历了从不相关状态到日益相关状态的突然转变。这种奇特的行为发生在振荡器的频率远低于量子比特的频率的极限；离开这个极限，就会得到一个有限宽度的过渡区。通过对能级结构、振子场及其压缩和量子比特-振子关联的分析，我们深入了解了跃迁的本质和相关的临界行为。DOI：10.1103/PhysRevA.87.013826
We consider the phase-transition-like behavior in the Rabi model containing a single two-level system, or qubit, and a single harmonic oscillator. The system experiences a sudden transition from an uncorrelated state to an increasingly correlated one as the qubit-oscillator coupling strength is varied and increased past a critical point. This singular behavior occurs in the limit where the oscillator's frequency is much lower than the qubit's frequency; away from this limit one obtains a finite-width transition region. By analyzing the energy-level structure, the value of the oscillator field and its squeezing and the qubit-oscillator correlation, we gain insight into the nature of the transition and the associated critical behavior. DOI: 10.1103/PhysRevA.87.013826