Adiabatic approximation in the ultrastrong-coupling regime of an oscillator and two qubits |
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Authors: | Ping Yang Ping ZouZhi-Ming Zhang |
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Institution: | Laboratory of Nanophotonic Functional Materials and Devices, SIPSE and LQIT, South China Normal University, Guangzhou 510006, China |
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Abstract: | We present a system composed of two flux qubits and a transmission-line resonator. Instead of using the rotating wave approximation (RWA), we analyze the system by the adiabatic approximation methods under two opposite extreme conditions. Basic properties of the system are calculated and compared under these two different conditions. Relative energy-level spectrum of the system in the adiabatic displaced oscillator basis is shown, and the theoretical result is compared with the numerical solution. |
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Keywords: | Circuit QED Ultrastrong coupling Adiabatic approximation |
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