Stabilization of product states and excited-state quantum phase transitions in a coupled qubit-field system
Stabilization of product states and excited-state quantum phase transitions in a coupled qubit-field system
We study a system of a single qubit (or a few qubits) interacting with a soft-mode bosonic field. Considering an extended version of the Rabi model with both parity-conserving and parity-violating interactions, we disclose a complex arrangement of quantum phase transitions in the ground- and excited-state domains. An experimentally testable …