Nonequilibrium and Nonperturbative Dynamics of Ultrastrong Coupling in Open Lines

Peropadre, Borja ; Zueco, David (Universidad de Zaragoza) ; Porras, Diego ; García-Ripoll, Juan José

Resumen: The 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.

Idioma: Inglés

DOI: 10.1103/PhysRevLett.111.243602

Año: 2013

Publicado en: Physical Review Letters 111 (2013), 243602
ISSN: 0031-9007

Factor impacto JCR: 7.728 (2013)

Categ. JCR: PHYSICS, MULTIDISCIPLINARY rank: 6 / 78 = 0.077 (2013) - Q1 - T1

Financiación: info:eu-repo/grantAgreement/ES/CAM/QUITEMAD-S2009-ESP-1594
Financiación: info:eu-repo/grantAgreement/EC/FP7/258191/EU/Participative Research labOratory for Multimedia and Multilingual Information Systems Evaluation/PROMISE
Financiación: info:eu-repo/grantAgreement/ES/MINECO/FIS2011-25167
Financiación: info:eu-repo/grantAgreement/ES/MINECO/FIS2012-33022

Tipo y forma: Article (Published version)

Área (Departamento): Área Física Materia Condensada (Dpto. Física Materia Condensa.)