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Andreev Spectroscopy for Superconducting Phase Qubits

Mikhail V. Feigel'man·Lev B. Ioffe·Vadim B. Geshkenbein·Gianni Blatter
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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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Mikhail V. Feigel'man, Lev B. Ioffe, Vadim B. Geshkenbein, Gianni Blatter. 1999-10-31. Andreev Spectroscopy for Superconducting Phase Qubits. https://arxiv.org/abs/cond-mat/9910506

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