Quantum nondemolition measurements for quantum information

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

doi:10.1103/PhysRevA.73.012113

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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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.

Original language	English
Article number	012113
Journal	Physical Review A - Atomic, Molecular, and Optical Physics
Volume	73
Issue number	1
DOIs	https://doi.org/10.1103/PhysRevA.73.012113
Publication status	Published - 2006
Externally published	Yes

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Quantum nondemolition measurements for quantum information

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