Quantum nondemolition measurements of a qubit

Preprint

6 February 2002

preprint
Published by arXiv in arXiv

https://doi.org/10.48550/arXiv.cond-mat/0202082

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 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.

Keywords

NONDEMOLITION MEASUREMENTS
QUANTUM NONDEMOLITION
INDUCED DEPHASING
SUGGESTED SCHEME
JUNCTION QUBITS
CHARGE DYNAMICS
OSCILLATIONS
QUBIT
QND

All Related Versions

Version 1, 2002-02-06, ArXiv
Published version: Physical Review Letters, 88 (20), 207901.

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