TY  - JOUR
AU  - Houzet, M.
AU  - Serniak, K.
AU  - Catelani, G.
AU  - Devoret, M. H.
AU  - Glazman, L. I.
TI  - Photon-Assisted Charge-Parity Jumps in a Superconducting Qubit
JO  - Physical review letters
VL  - 123
IS  - 10
SN  - 1079-7114
CY  - College Park, Md.
PB  - APS
M1  - FZJ-2019-04580
SP  - 107704
PY  - 2019
AB  - 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.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000485201800019
DO  - DOI:10.1103/PhysRevLett.123.107704
UR  - https://juser.fz-juelich.de/record/865015
ER  -