SciPost Phys. 6, 013 (2019) ·
published 29 January 2019

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We study the effect of nonequilibrium quasiparticles on the operation of a superconducting device (a qubit or a resonator), including heating of the quasiparticles by the device operation. Focusing on the competition between heating via lowfrequency photon absorption and cooling via photon and phonon emission, we obtain a remarkably simple nonthermal stationary solution of the kinetic equation for the quasiparticle distribution function. We estimate the influence of quasiparticles on relaxation and excitation rates for transmon qubits, and relate our findings to recent experiments.
Luigi Amico, Denis M. Basko, F Sebastián Bergeret, Olivier Buisson, Hervé Courtois, Rosario Fazio, Wiebke Guichard, Anna Minguzzi, Jukka Pekola, Gerd Schön
SciPost Phys. 5, 009 (2018) ·
published 27 July 2018

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Frank W. J. Hekking performed his PhD work on "Aspects of Electron Transport
in Semiconductor Nanostructures" at the TU Delft in 1992. He then worked as a
postdoc at the University of Karlsruhe, the University of Minnesota, the
Cavendish Laboratory at the University of Cambridge, and the Ruhr University at
Bochum. In 1999 he joined the LPMMC (Laboratoire de Physique et Mod\' elisation
des Milieux Condens\' es) in Grenoble and was appointed Professor at the
Universit\' e Joseph Fourier and afterwards Universit\' e Grenoble Alpes. Frank
Hekking was nominated as a member of the Institut Universitaire de France, for
the periods 20022007 and 20122017. This review provides an overview of his
scientific contributions to several fields of mesoscopic electron transport and
superconductivity as well as atomic gases, and is organized along sections
describing the different themes.