Entanglement and Sensitivity in Precision Measurements with States of a Fluctuating Number of Particles
Authors: Hyllus P., Pezzé L., Smerzi A.
Autors Affiliation: INO-CNR BEC Center and Dipartimento di Fisica, Università di Trento, I-38123 Povo, Italy;
Laboratoire Charles Fabry de l’Institut d’Optique, CNRS and Univ. Paris-Sud, Campus Polytechnique, RD 128, F-91127 Palaiseau cedex, France
Abstract: The concepts of separability, entanglement, spin squeezing, and the Heisenberg limit are central in the theory of quantum-enhanced metrology. In the current literature, these are well established only in the case of linear interferometers operating with input quantum states of a known fixed number of particles. This manuscript generalizes these concepts and extends the quantum phase estimation theory by taking into account classical and quantum fluctuations of the particle number. Our analysis concerns most of the current experiments on precision measurements where the number of particles is known only on average.
Journal/Review: PHYSICAL REVIEW LETTERS
Volume: 105 (12) Pages from: 120501 to: 120501
KeyWords: quantum interferometry; heisenberg limit; entaglementDOI: 10.1103/PhysRevLett.105.120501Citations: 64data from “WEB OF SCIENCE” (of Thomson Reuters) are update at: 2020-02-23References taken from IsiWeb of Knowledge: (subscribers only)Connecting to view paper tab on IsiWeb: Click hereConnecting to view citations from IsiWeb: Click here