2026-06-29T02:44:09Zhttps://docta.ucm.es/rest/oai/request

oai:docta.ucm.es:20.500.14352/597262023-08-27T13:33:01Zcom_20.500.14352_14col_20.500.14352_15

00925njm 22002777a 4500 dc Luis Aina, Alfredo author Peřina, J. author 1996-11 The problem of a correct quantum description of the phase difference is examined from the perspective of parameter estimation theory. It is shown that an optimum phase-shift measurement defines a phase difference operator which coincides with other approaches to the same problem. We also study the fundamental limit to the accuracy of a phase difference shift detection. We show that this limit can be reached by a measurement having countable outcomes despite the fact that a phase shift can take any value. We show that this is the case of the phase difference operator defined by an optimum phase-shift measurement. 1050-2947 10.1103/PhysRevA.54.4564 https://hdl.handle.net/20.500.14352/59726 http://dx.doi.org/10.1103/PhysRevA.54.4564 http://journals.aps.org/ Optimum phase-shift estimation and the quantum description of the phase difference