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Dynamics of superconducting qubits in open transmission lines

AuthorsGarcía-Ripoll, Juan José ; Zueco, David; Porras, Diego; Peropadre, Borja
Issue Date3-Mar-2014
PublisherAmerican Physical Society
CitationAPS March Meeting 2014
AbstractThe time and space resolved dynamics of a superconducting qubit with an Ohmic coupling to propagating 1D photons is studied, from weak coupling to the ultrastrong coupling regime (USC). A nonperturbative study based on Matrix Product States (MPS) 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 renormalisation. These results set the foundations for future studies and engineering of the interactions between superconducting qubits and propagating photons, as well as the design of photon-photon interactions based on artificial materials built from these qubits.
DescriptionResumen del trabajo presentado al "APS March Meeting" celebrado en Denver, Colorado (US) del 3 al 7 de marzo de 2014.
Publisher version (URL)http://meetings.aps.org/Meeting/MAR14/Session/A34.6
Appears in Collections:(ICMA) Comunicaciones congresos
(CFMAC-IFF) Comunicaciones congresos
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