Physics – Quantum Physics
Scientific paper
2005-09-26
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.
Giovannetti Vittorio
Lloyd Seth
Maccone Lorenzo
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