Quantum nondemolition measurements for quantum information

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

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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.

Original languageEnglish
Article number012113
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Issue number1
Publication statusPublished - 2006
Externally publishedYes


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