Quasi-particle transitions in charge-phase qubits probed by rf oscillations

Details Quasi-particle transitions in charge-phase qubits probed by rf oscillations Quasi-particle transitions in charge-phase qubits probed by rf oscillations

2007-01-08

arxiv.org/abs/cond-mat/0701144v2

Phys. Rev. B 76, 134507 (2007)

Physics

Condensed Matter

Other Condensed Matter

7 pages, 4 figures, major changes in the revised manuscript

Scientific paper

10.1103/PhysRevB.76.134507

We investigated transitions in Al charge-phase qubits of SQUID-configuration inductively coupled to an rf tank circuit that made it possible to read out the state by measuring the inductance of the qubit. Depending on the flux and charge bias and the amplitude of the rf oscillations we probed either the ground state or a dynamic change of the qubit states which we attributed to stochastic single quasi-particle tunneling onto and off the qubit island and exchange of energy with the qubit. Within this model, a selection rule for quasi-particle-induced transitions in the qubit is discussed.

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