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Ideal quantum nondemolition measurement of a flux qubit at variable bias

Type of publication Peer-reviewed
Publikationsform Original article (peer-reviewed)
Author Wang YD, Zhu XB, Bruder C,
Project Quantum coherence, quantum statistics, and superconductivity in mesoscopic systems
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Original article (peer-reviewed)

Volume (Issue) 83(13)
Page(s) 134504 - 134504
Title of proceedings PHYSICAL REVIEW B


We propose a scheme to realize a quantum nondemolition (QND) measurement of a superconducting flux qubit by a Josephson bifurcation amplifier. Our scheme can implement a perfect QND measurement for a qubit subject to a variable magnetic bias. Measurement back-action-induced qubit relaxation can be suppressed and hence the QND fidelity is expected to be high over a wide range of bias conditions.