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Nonequilibrium and nonperturbative dynamics of ultrastrong coupling in open lines

AutorPeropadre, Borja ; Zueco, David; Porras, Diego; García-Ripoll, Juan José
Fecha de publicación2013
EditorAmerican Physical Society
CitaciónPhysical Review Letters 111: 243602 (2013)
ResumenThe time and space resolved dynamics of a qubit with an Ohmic coupling to propagating 1D photons is studied, from weak coupling to the ultrastrong coupling regime. A nonperturbative study based on matrix product states shows the following results, (i) The ground state of the combined systems contains excitations of both the qubit and the surrounding bosonic field. (ii) An initially excited qubit equilibrates through spontaneous emission to a state, which under certain conditions is locally close to that ground state, both in the qubit and the field. (iii) The resonances of the combined qubit-photon system match those of the spontaneous emission process and also the predictions of the adiabatic renormalization [A. J. Leggett et al., Rev. Mod. Phys. 59, 1 (1987)]. Finally, nonperturbative ab initio calculations show that this physics can be studied using a flux qubit galvanically coupled to a superconducting transmission line. © 2013 American Physical Society.
DescripciónUnder the terms of the Creative Commons Attribution License 3.0 (CC-BY).
Versión del editorhttp://dx.doi.org/10.1103/PhysRevLett.111.243602
URIhttp://hdl.handle.net/10261/117708
DOI10.1103/PhysRevLett.111.243602
Identificadoresdoi: 10.1103/PhysRevLett.111.243602
issn: 0031-9007
e-issn: 1079-7114
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