Physics – Quantum Physics
Scientific paper
2010-07-06
PRL 107, 113603 (2011)
Physics
Quantum Physics
8 pages, 3 figures
Scientific paper
10.1103/PhysRevLett.107.113603
Quantum physics holds the promise of enabling certain tasks with better performance than possible when only classical resources are employed. The quantum phenomena present in many experiments signify nonclassical behavior, but do not always imply superior performance. Quantifying the enhancement achieved from quantum behavior requires careful analysis of the resources involved. We analyze the specific case of parameter estimation using an optical interferometer, where increased precision can be achieved using quantum probe states. Common performance measures are examined and it is shown that some overestimate the improvement. For the simplest experimental case we compare the different measures and show this overestimate explicitly. We give the preferred analysis of real-world experiments and calculate benchmark values for experimental parameters necessary to realize a precision enhancement.
Datta Animesh
Dorner Uwe
Smith Brian J.
Thomas-Peter Nicholas
Walmsley Ian A.
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