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Andreev Spectroscopy for Superconducting Phase Qubits

Mikhail V. Feigel'man, Lev B. Ioffe, Vadim B. Geshkenbein, Gianni Blatter

cond-matarXiv:cond-mat/9910506

Abstract

We propose a new method to measure the coherence time of superconducting phase qubits based on the analysis of the magnetic-field dependent dc nonlinear Andreev current across a high-resistance tunnel contact between the qubit and a dirty metal wire and derive a quantitative relation between the subgap I-V characteristic and the internal correlation function of the qubit.

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