Entanglement, Nonlinear Dynamics, and the Heisenberg Limit
Authors: Pezzé L., Smerzi A.
Autors Affiliation: BEC-CNR-INFM and Dipartimento di Fisica, Università di Trento, I-38050 Povo, Italy
Abstract: We show that quantum Fisher information provides a sufficient condition to recognize multiparticle entanglement in an N qubit state. The same criterion gives a necessary and sufficient condition for sub-shot-noise phase sensitivity in the estimation of a collective rotation angle theta. The analysis therefore singles out the class of entangled states which are useful to overcome classical phase sensitivity in metrology and sensors. We finally study the creation of useful entangled states by the nonlinear dynamical evolution of two decoupled Bose-Einstein condensates or trapped ions.
Journal/Review: PHYSICAL REVIEW LETTERS
Volume: 102 (10) Pages from: 100401 to: 100401
KeyWords: quantum interferometry; entanglement; heisenberg limitDOI: 10.1103/PhysRevLett.102.100401Citations: 583data from “WEB OF SCIENCE” (of Thomson Reuters) are update at: 2023-09-24References taken from IsiWeb of Knowledge: (subscribers only)Connecting to view paper tab on IsiWeb: Click hereConnecting to view citations from IsiWeb: Click here