Ideal Quantum non-demolishing measurement of a flux qubit at variable bias

Details Ideal Quantum non-demolishing measurement of a flux qubit at variable bias Ideal Quantum non-demolishing measurement of a flux qubit at variable bias

2010-11-30

arxiv.org/abs/1011.6529v1

Phys. Rev. B 83, 134504 (2011)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

7 pages, 4 figures

Scientific paper

We propose a scheme to realize a quantum non-demolition (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.

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