期刊
PHYSICAL REVIEW A
卷 95, 期 5, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.95.053854
关键词
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资金
- French Agence Nationale de la Recherche (SemiQuantRoom Project) [ANR-14-CE26-0029-01]
- University Sorbonne Paris Cite EQDOL contract
- PRES-TIGE program under Marie Curie Actions-COFUND of the FP7
- Spanish MINECO/FEDER [FIS2015-69983-P]
- Basque Government [IT986-16, UPV/EHU UFI11/55]
- Agence Nationale de la Recherche (ANR) [ANR-14-CE26-0029] Funding Source: Agence Nationale de la Recherche (ANR)
The controllability of current quantum technologies allows one to implement spin-boson models where two-photon couplings are the dominating terms of light-matter interaction. In this case, when the coupling strength becomes comparable with the characteristic frequencies, a spectral collapse can take place, i.e., the discrete system spectrum can collapse into a continuous band. Here, we analyze the thermodynamic limit of the two-photon Dicke model, which describes the interaction of an ensemble of qubits with a single bosonic mode. We find that there exists a parameter regime where two-photon interactions induce a superradiant phase transition, before the spectral collapse occurs. Furthermore, we extend themean-field analysis by considering second-order quantum fluctuation terms, in order to analyze the low-energy spectrum and compare the critical behavior with the one-photon case.
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