Period-voltage-driven quantum phase transition of superconducting charge qubits

Gang Chen; Junqi Li; Jiuqing Liang

doi:10.1103/PhysRevB.76.054512

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Period-voltage-driven quantum phase transition of superconducting charge qubits

Gang Chen, Junqi Li, Jiuqing Liang

DOI 10.1103/PhysRevB.76.054512 · Physical Review B

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Abstract

In this paper, we employ an experimentally feasible scheme to realize a uniaxial spin model in superconducting charge qubits connected in parallel to a common superconducting inductance. Furthermore, we demonstrate that this nonlinear spin model with nonzero parallel field can give rise to a second-order phase transition under periodic modulation. It is shown that, when the amplitude of the periodically driven gate voltage in our proposal is varied, this second-order phase transition occurs from a normal to a deformed phase in the resonant case. Furthermore, in this system the adiabatic and cyclic conditions needed to generate the geometric phase can be easily implemented, and therefore this predicted phase transition could be detected in experiments by measuring the ground-state geometric phase.