%0 Journal Article
%A Houzet, M.
%A Serniak, K.
%A Catelani, G.
%A Devoret, M. H.
%A Glazman, L. I.
%T Photon-Assisted Charge-Parity Jumps in a Superconducting Qubit
%J Physical review letters
%V 123
%N 10
%@ 1079-7114
%C College Park, Md.
%I APS
%M FZJ-2019-04580
%P 107704
%D 2019
%X We evaluate the rates of energy and phase relaxation of a superconducting qubit caused by stray photons with energy exceeding the threshold for breaking a Cooper pair. All channels of relaxation within this mechanism are associated with the change in the charge parity of the qubit, enabling the separation of the photon-assisted processes from other contributions to the relaxation rates. Among the signatures of the new mechanism is the same order of rates of the transitions in which a qubit loses or gains energy, which is in agreement with recent experiments. Our theory offers the possibility to characterize the electromagnetic environment of superconducting devices at the single-photon level for frequencies above the superconducting gap.
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000485201800019
%R 10.1103/PhysRevLett.123.107704
%U https://juser.fz-juelich.de/record/865015