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 limitDOI: 10.1103/PhysRevLett.102.100401Citazioni: 628dati da “WEB OF SCIENCE” (of Thomson Reuters) aggiornati al: 2024-04-28Riferimenti tratti da Isi Web of Knowledge: (solo abbonati) Link per visualizzare la scheda su IsiWeb: Clicca quiLink per visualizzare la citazioni su IsiWeb: Clicca qui