Entanglement, Nonlinear Dynamics, and the Heisenberg Limit

Year: 2009

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 limit
DOI: 10.1103/PhysRevLett.102.100401

Citations: 551
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