Photon blockade in the ultrastrong coupling regime.
Photon blockade in the ultrastrong coupling regime.
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DOI：
10.1103/physrevlett.109.193602
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发表时间：
2012-06
影响因子：
8.6
通讯作者：
A. Ridolfo;M. Leib;S. Savasta;M. Hartmann
中科院分区：
文献类型：
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作者：
A. Ridolfo;M. Leib;S. Savasta;M. Hartmann
我们研究了超强耦合下的光子符合计数统计，在超强耦合下，原子-腔的耦合率与腔的共振频率相当。在这种情况下，通常的正态关联函数不能描述输出光子统计特性。通过用腔-发射体修饰基来表示电场算符，我们能够提出对任意程度的光-物质相互作用有效的关联函数。我们的结果表明，标准的光子阻挡场景对于超强耦合有显著的修正。我们甚至观察到了两能级发射体的参数过程和强度关联函数在超强光子发射体耦合所给出的频率下的时间振荡。这些效应可以追溯到由反向旋转相互作用项引起的双光子级联衰变的存在。
We explore photon coincidence counting statistics in the ultrastrong coupling regime, where the atom-cavity coupling rate becomes comparable to the cavity resonance frequency. In this regime, usual normal order correlation functions fail to describe the output photon statistics. By expressing the electric-field operator in the cavity-emitter dressed basis, we are able to propose correlation functions that are valid for arbitrary degrees of light-matter interaction. Our results show that the standard photon blockade scenario is significantly modified for ultrastrong coupling. We observe parametric processes even for two-level emitters and temporal oscillations of intensity correlation functions at a frequency given by the ultrastrong photon emitter coupling. These effects can be traced back to the presence of two-photon cascade decays induced by counterrotating interaction terms.