Resonant Readout of a Persistent Current Qubit

Details Resonant Readout of a Persistent Current Qubit Resonant Readout of a Persistent Current Qubit

2005-01-12

arxiv.org/abs/cond-mat/0501283v1

IEEE TRANS APPL SUPERCON 15 (2): 841-844 Part 1 JUN 2005

Physics

Condensed Matter

Superconductivity

4 pages, 2004 ASC Proceedings

Scientific paper

We have implemented a resonant circuit that uses a SQUID as a flux-sensitive Josephson inductor for qubit readout. In contrast to the conventional switching current measurement that generates undesired quasi-particles when the SQUID switches to the voltage state, our approach keeps the readout SQUID biased along the supercurrent branch during the measurement. By incorporating the SQUID inductor in a high-Q resonant circuit, we can distinguish the two flux states of a niobium persistent-current (PC) qubit by observing a shift in the resonant frequency of both the magnitude and the phase spectra. The readout circuit was also characterized in the nonlinear regime to investigate its potential use as a nonlinear amplifier.

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