Freiburg 2019 – wissenschaftliches Programm

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FM: Fall Meeting

FM 39: Quantum Computation: Hardware Platforms II

FM 39.4: Talk

Dienstag, 24. September 2019, 15:00–15:15, 3044

Photon-assisted charge-parity jumps in a superconducting qubit — Manuel Houzet¹, Kyle Serniak², •Gianluigi Catelani^3,4, Michel Devoret², and Leonid Glazman² — ¹CEA, Grenoble, France — ²Depts. of Physics and Applied Physics, Yale University, New Haven, USA — ³JARA Institute for Quantum Information, Forschungszentrum Jülich, Germany — ⁴Yale Quantum Institute, Yale University, New Haven, USA

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. Our theory offers a natural explanation of recent measurements.