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quant-ph2021
Stabilization of product states and excited-state quantum phase transitions in a coupled qubit-field system
Pavel Stránský, Pavel Cejnar, Radim Filip
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…
quant-ph2021★ 5 cited
Continuum analogues of excited-state quantum phase transitions
Pavel Stránský, Milan Šindelka, Pavel Cejnar
Following our work [Phys. Rev. Lett. 125, 020401 (2020)], we discuss a semiclassical description of one-dimensional quantum tunneling through multibarrier potentials in terms of co…