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Kinetics of nonequilibrium quasiparticle tunneling in superconducting charge qubits

M. D. Shaw ; R. M. Lutchyn ; Per Delsing (Institutionen för mikroteknologi och nanovetenskap, Kvantkomponentfysik) ; P. M. Echternach
Physical Review B (1098-0121). Vol. 78 (2008), 2, p. 024503.
[Artikel, refereegranskad vetenskaplig]

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.



Denna post skapades 2008-09-01. Senast ändrad 2016-07-07.
CPL Pubid: 73424

 

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