Quantum metrology

Details Quantum metrology Quantum metrology

2005-09-26

arxiv.org/abs/quant-ph/0509179v1

Phys. Rev. Lett. 96, 010401 (2006)

Physics

Quantum Physics

4 pages, 2 figures

Scientific paper

10.1103/PhysRevLett.96.010401

We point out a general framework that encompasses most cases in which quantum effects enable an increase in precision when estimating a parameter (quantum metrology). The typical quantum precision-enhancement is of the order of the square root of the number of times the system is sampled. We prove that this is optimal and we point out the different strategies (classical and quantum) that permit to attain this bound.

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