Quantum information and precision measurement

Details Quantum information and precision measurement Quantum information and precision measurement

1999-04-06

arxiv.org/abs/quant-ph/9904021v2

J.Mod.Opt. 47 (2000) 155-176

Physics

Quantum Physics

13 pages, 1 figure, proof of conjecture added

Scientific paper

10.1080/09500340008244034

We describe some applications of quantum information theory to the analysis of quantum limits on measurement sensitivity. A measurement of a weak force acting on a quantum system is a determination of a classical parameter appearing in the master equation that governs the evolution of the system; limitations on measurement accuracy arise because it is not possible to distinguish perfectly among the different possible values of this parameter. Tools developed in the study of quantum information and computation can be exploited to improve the precision of physics experiments; examples include superdense coding, fast database search, and the quantum Fourier transform.

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