Spectral collapse in multiqubit two-photon Rabi model
Open Access
- 8 March 2021
- journal article
- research article
- Published by Springer Science and Business Media LLC in Scientific Reports
- Vol. 11 (1), 1-9
- https://doi.org/10.1038/s41598-021-84934-y
Abstract
We have shown that the smallest possible singel-qubit critical coupling strength of the N-qubit two-photon Rabi model is only 1/N times that of the two-photon Rabi model. The spectral collapse can thus occur at a more attainable value of the critical coupling. For both of the two-qubit and three-qubit cases, we have also rigorously demonstrated that at the critical coupling the system not only has a set of discrete eigenenergies but also a continuous energy spectrum. The discrete eigenenergy spectrum can be derived via a simple one-to-one mapping to the bound state problem of a particle of variable effective mass in the presence of a finite potential well and a nonlocal potential. The energy difference of each qubit, which specifies both the depth of the finite potential well and the strength of the nonlocal potential, determines the number of bound states available, implying that the extent of the incomplete spectral collapse can be monitored in a straightforward manner.This publication has 33 references indexed in Scilit:
- Two-Photon Rabi Splitting in a Coupled System of a Nanocavity and Exciton ComplexesPhysical Review Letters, 2018
- Nonlinear quantum Rabi model in trapped ionsPhysical Review A, 2018
- Two-photon quantum Rabi model with superconducting circuitsPhysical Review A, 2018
- Protected ultrastrong coupling regime of the two-photon quantum Rabi model with trapped ionsPhysical Review A, 2017
- Highly efficient two-photon generation from a coherently pumped quantum dot embedded in a microcavityPhysical Review B, 2016
- Spectral collapse via two-phonon interactions in trapped ionsPhysical Review A, 2015
- Two-photon lasing by a single quantum dot in a high-microcavityPhysical Review B, 2010
- Two-photon Rabi oscillations in a singlequantum dotPhysical Review B, 2006
- Generating and Probing a Two-Photon Fock State with a Single Atom in a CavityPhysical Review Letters, 2002
- Realization of a two-photon maser oscillatorPhysical Review Letters, 1987