Kinetics of nonequilibrium quasiparticle tunneling in superconducting charge qubits
Artikel i vetenskaplig tidskrift, 2008

We directly observe low-temperature nonequilibrium quasiparticle tunneling in charge qubits based on the single-Cooper-pair box. We measure even- and odd-state dwell-time distributions as a function of temperature, and interpret these results using a kinetic theory. While the even-state lifetime is exponentially distributed, the odd-state distribution is more heavily weighted to short times, implying that odd-to-even tunnel events are not described by a homogenous Poisson process. The mean odd-state dwell time increases sharply at low temperature, which is consistent with quasiparticles tunneling out of the island before reaching thermal equilibrium.


M. D. Shaw

University of Southern California

R. M. Lutchyn

University of Maryland

Per Delsing

Chalmers, Mikroteknologi och nanovetenskap, Kvantkomponentfysik

P. M. Echternach

University of Southern California

Jet Propulsion Laboratory, California Institute of Technology

Physical Review B - Condensed Matter and Materials Physics

24699950 (ISSN) 24699969 (eISSN)

Vol. 78 2 024503- 024503


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