Quantum limit of measurement and the projection postulate

Details Quantum limit of measurement and the projection postulate Quantum limit of measurement and the projection postulate

2005-07-20

arxiv.org/abs/quant-ph/0507197v2

International Journal of Modern Physics B20, 1363 (2006)

Physics

Quantum Physics

References added, typo-errors corrected. This paper is based on work presented at the 9th International Conference on Squeezed

Scientific paper

10.1142/S0217979206033978

We study an electrostatic qubit monitored by a point-contact detector. Projecting an entire qubit-detector wave function on the detector eigenstates we determine the precision limit for the qubit measurements, allowed by quantum mechanics. We found that this quantity is determined by qubit dynamics as well as decoherence, generated by the measurement. Our results show how the quantum precision limit can be improved by a proper design of a measurement procedure.

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