Ground state of a resonant two-qubit cavity system in the ultrastrong-coupling regime
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AbstractWe examine a generalized Rabi model formed by two identical qubits interacting with a common oscillator mode. In the near-resonance configuration where the oscillator frequency is close to the transition frequency of the qubit, we determine the ground state of the model approximately by using a variational method and a transformation method. Both methods are shown to approximate the ground state accurately for a range of coupling strengths in the ultrastrong-coupling regime. In addition, the accuracy of the approximation can be further improved by using perturbation theory. We also characterize the ground-state entanglement between the two qubits by calculating the negativity.
All Author(s) ListLee KMC, Law CK
Journal namePhysical Review A
Volume Number88
Issue Number1
PublisherAmerican Physical Society
LanguagesEnglish-United Kingdom
Web of Science Subject CategoriesOptics; OPTICS; Physics; Physics, Atomic, Molecular & Chemical; PHYSICS, ATOMIC, MOLECULAR & CHEMICAL

Last updated on 2021-17-02 at 00:25