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Quantum Nondemolition Measurements of a Qubit

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Abstract

The concept of quantum nondemolition (QND) measurement is extended to coherent oscillations in an individual two-state system. Such a measurement enables direct observation of an intrinsic spectrum of these oscillations avoiding the detector-induced dephasing that affects the standard (non-QND) measurements. The suggested scheme can be realized in Josephson-junction qubits which combine flux and charge dynamics.

Original languageEnglish
Article number207901
Pages (from-to)4
Number of pages1
JournalPhysical Review Letters
Volume88
Issue number20
DOIs
StatePublished - 2002

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