Quantum nondemolition measurements of a qubit

Details Quantum nondemolition measurements of a qubit Quantum nondemolition measurements of a qubit

2002-02-06

arxiv.org/abs/cond-mat/0202082v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 2 figures

Scientific paper

10.1103/PhysRevLett.88.207901

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 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.

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