Modulation-based superradiant phase transition in the strong-coupling regime
Modulation-based superradiant phase transition in the strong-coupling regime
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DOI：
10.1103/physreva.107.063713
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发表时间：
2022-08
影响因子：
2.9
通讯作者：
Jin‐Feng Huang;L. Tian
中科院分区：
文献类型：
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作者：
Jin‐Feng Huang;L. Tian
当光-物质耦合强度超过超强耦合时，迪凯模型可以表现出正常相和超辐射相之间的量子相变。然而，由于有限的耦合强度或有限的双光子$A^{2}$项，在实际系统中观察这种相变是具有挑战性的。在这里，我们表明，通过施加一个周期性调制的两个能级系统的频率在一个标准的迪凯模型在强耦合制度，各向异性迪凯模型与可调的旋转和反旋转的条款在超强耦合制度可以实现。我们计算了该模型的基态和激发光谱的调制参数。结果表明，在强耦合的腔量子电动力学系统或电路量子电动力学系统中可以观察到超辐射相。
The Dicke model can exhibit quantum phase transition between the normal and the superradiant phases when the strength of the light-matter coupling exceeds the ultrastrong coupling regime. However, it is challenging to observe this phase transition in practical systems due to limited coupling strength or finite two-photon $A^{2}$ terms. Here we show that by applying a periodic modulation to the frequency of the two-level systems in a standard Dicke model in the strong coupling regime, an anisotropic Dicke model with tunable rotating and counter-rotating terms in the ultrastrong coupling regime can be achieved. We calculate the ground state and the excitation spectrum of this model in terms of the modulation parameters. Our result shows that the superradiant phases can be observed in cavity- or circuit-quantum electrodynamics systems with strong coupling.