Quantum Nondemolition Measurements of a Qubit

D. V. Averin
Phys. Rev. Lett. 88, 207901 – Published 1 May 2002
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Abstract

The concept of quantum nondemolition (QND) measurement is extended to coherent oscillations in an individual two-state system. Such a measurement enables direct observation of an intrinsic spectrum of these oscillations avoiding the detector-induced dephasing that affects the standard (non-QND) measurements. The suggested scheme can be realized in Josephson-junction qubits which combine flux and charge dynamics.

  • Received 5 February 2002

DOI:https://doi.org/10.1103/PhysRevLett.88.207901

©2002 American Physical Society

Authors & Affiliations

D. V. Averin

  • Department of Physics and Astronomy, SUNY Stony Brook, Stony Brook, New York 11794-3800

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Vol. 88, Iss. 20 — 20 May 2002

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