Detection of a persistent-current qubit by resonant activation
P. Bertet, I. Chiorescu, K. Semba, C.J.P.M Harmans, J.E. Mooij
TL;DR
This paper introduces a novel method for detecting the quantum state of a persistent-current qubit using resonant activation of a SQUID's plasma frequency, achieving rapid measurements with high visibility.
Contribution
The study demonstrates a new detection scheme based on resonant activation of a SQUID, enabling fast and high-visibility quantum state measurements of a persistent-current qubit.
Findings
Achieved Rabi oscillations with 65% visibility
Used a 5ns measurement pulse for state detection
Validated the dependency of SQUID plasma frequency on qubit state
Abstract
We present the implementation of a new scheme to detect the quantum state of a persistent-current qubit. It relies on the dependency of the measuring Superconducting Quantum Interference Device (SQUID) plasma frequency on the qubit state, which we detect by resonant activation. With a measurement pulse of only 5ns, we observed Rabi oscillations with high visibility (65%).
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