Low-crosstalk bifurcation detectors for coupled flux qubits

Abstract

We present experimental results on the crosstalk between two AC-operated dispersive bifurcation detectors, implemented in a circuit for high-fidelity readout of two strongly coupled flux qubits. Both phase-dependent and phase-independent contributions to the crosstalk are analyzed. For proper tuning of the phase the measured crosstalk is 0.1 % and the correlation between the measurement outcomes is less than 0.05 %. These results show that bifurcative readout provides a reliable and generic approach for multi-partite correlation experiments.

Copyright 2010 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Applied Physics Letters and may be found at http://link.aip.org/link/?apl/96/123508

References in corpus (5)

• An RF-Driven Josephson Bifurcation Amplifier for Quantum Measurements
• Single-shot qubit readout in circuit Quantum Electrodynamics
• Single-shot qubit readout in circuit Quantum Electrodynamics
• Quantum non-demolition measurement of a superconducting two-level system
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Cited by in corpus (5)

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• Benchmarking the quality of multiplexed qubit readout beyond assignment fidelity
• Mitigation of correlated readout errors without randomized measurements
• Hybrid Quantum Interferometer in Bifurcation Mode as a Latching Quantum Readout