研究目的
Investigating the ultrastrong-coupling regime of nondipolar light-matter interactions and proposing a circuit-QED scheme to observe the onset of the spectral collapse in a solid-state device.
研究成果
The study demonstrates that fundamental quantum optical phenomena due to an ultrastrong nondipolar light-matter interaction can be observed with current circuit-QED technology. The proposed device realizes the two-photon quantum Rabi model in the nonperturbative USC regime, revealing changes in selection rules and the onset of the spectral collapse. The findings pave the way for the direct observation of the spectral collapse in a solid-state device.
研究不足
The study is limited by the approximations made in the system Hamiltonian, such as neglecting higher-order terms in the expansion of the cosine functions and the adiabatic elimination of the coupling inductance degree of freedom. The validity of the two-level approximation is also expected to break down at the collapse point.
1：Experimental Design and Method Selection:
The study employs a circuit-QED scheme involving a flux qubit and a superconducting quantum interference device (SQUID) galvanically coupled through a small inductance. The system Hamiltonian is approximated by a two-photon quantum Rabi model.
2：Sample Selection and Data Sources:
The system consists of a single qubit and a quantum resonator, with parameters chosen to meet the two-photon resonance condition.
3：List of Experimental Equipment and Materials:
The setup includes a flux qubit, a SQUID operated in the linear regime, and a small inductance for coupling.
4：Experimental Procedures and Operational Workflow:
The system is driven by a monochromatic coherent field, and its response is characterized through fluorescence spectrum and output field correlation functions.
5：Data Analysis Methods:
The analysis involves numerical simulations of the system Hamiltonian and the use of Floquet-Liouville theory for the fluorescence spectrum.
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