Quantum nondemolition measurements for quantum information

T. C. Ralph, S. D. Bartlett, J. L. O’Brien, G. J. Pryde, and H. M. Wiseman

Phys. Rev. A 73, 012113 – Published 31 January 2006; Erratum Phys. Rev. A 73, 039902 (2006)

Abstract

We discuss the characterization and properties of quantum nondemolition (QND) measurements on qubit systems. We introduce figures of merit which can be applied to systems of any Hilbert space dimension, thus providing universal criteria for characterizing QND measurements. The controlled-NOT gate and an optical implementation are examined as examples of QND devices for qubits. We also consider the QND measurement of weak values.

Received 20 December 2004
Corrected 8 February 2006

DOI:https://doi.org/10.1103/PhysRevA.73.012113

Corrections

8 February 2006

Erratum

Publisher’s Note: Quantum nondemolition measurements for quantum information [Phys. Rev. A 73, 012113 (2006)]

T. C. Ralph, S. D. Bartlett, J. L. O’Brien, G. J. Pryde, and H. M. Wiseman

Phys. Rev. A 73, 039902 (2006)

Authors & Affiliations

T. C. Ralph^1,2,*, S. D. Bartlett^2,3, J. L. O’Brien^1,2, G. J. Pryde^1,2,4, and H. M. Wiseman⁴

¹Centre for Quantum Computer Technology, University of Queensland, Brisbane, Queensland 4072, Australia
²Department of Physics, University of Queensland, Brisbane, Queensland 4072, Australia
³School of Physics, The University of Sydney, Sydney, New South Wales 2006, Australia
⁴Centre for Quantum Computer Technology, Center for Quantum Dynamics, School of Science, Griffith University, Brisbane, Queensland 4111, Australia

^*Electronic address: ralph@physics.uq.edu.au

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Vol. 73, Iss. 1 — January 2006

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