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American Physical Society, Physical Review A, 1(73), 2006

DOI: 10.1103/physreva.73.012113

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Quantum nondemolition measurements for quantum information

Journal article published in 2006 by T. C. Ralph, S. D. Bartlett ORCID, J. L. O'Brien, G. J. Pryde, H. M. Wiseman ORCID
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This paper is available in a repository.

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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.