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arXiv · 1904.06290

Photon-assisted charge-parity jumps in a superconducting qubit

M. Houzet·K. Serniak·G. Catelani·M. H. Devoret·L. I. Glazman
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Abstract

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 looses or gains energy.

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M. Houzet, K. Serniak, G. Catelani, M. H. Devoret, L. I. Glazman. 2019-04-12. Photon-assisted charge-parity jumps in a superconducting qubit. https://doi.org/10.1103/physrevlett.123.107704

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