RT Journal Article
T1 Nonequilibrium and nonperturbative dynamics of ultrastrong coupling in open lines
A1 Peropadre, B.
A1 Zueco, David
A1 Porras Torres, Diego
A1 García Ripoll, Juan José
AB 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.
PB American Physical Society
SN 0031-9007
YR 2013
FD 2013-12-09
LK https://hdl.handle.net/20.500.14352/35588
UL https://hdl.handle.net/20.500.14352/35588
LA eng
NO B. Peropadre, D. Zueco, D. Porras, and J. J. García-Ripoll, Nonequilibrium and Nonperturbative Dynamics of Ultrastrong Coupling in Open Lines, Phys. Rev. Lett. 111, 243602 (2013).
NO © American Physical Society.The authors acknowledge support from the European project PROMISCE, Spanish MINECO projects FIS2011-25167 and FIS2012-33022, CAM research consortium QUITEMAD (S2009-ESP-1594), and Spanish Ramon y Cajal program.
NO European Commission
NO Ministerio de Economía, Comercio y Empresa (España)
NO Comunidad de Madrid
NO Programa Ramón y Cajal (España)
DS Docta Complutense
RD 6 abr 2025