Theoretical analysis establishes universal figures of merit for quantum nondemolition measurements in qubit systems, indicating viable routes for optical quantum information processing.
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.
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Ralph et al. (2006) studied this question.
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