Entanglement, Nonlinear Dynamics, and the Heisenberg Limit

Anno: 2009

Autori: Pezzé L., Smerzi A.

Affiliazione autori: 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.

Giornale/Rivista: PHYSICAL REVIEW LETTERS

Volume: 102 (10)      Da Pagina: 100401  A: 100401

Parole chiavi: quantum interferometry; entanglement; heisenberg limit
DOI: 10.1103/PhysRevLett.102.100401

Citazioni: 625
dati da “WEB OF SCIENCE” (of Thomson Reuters) aggiornati al: 2024-04-14
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