Phase-sensitivity bounds for two-mode interferometers
Anno: 2015
Autori: Pezze L., Hyllus P., Smerzi A.
Affiliazione autori: INO CNR, QSTAR, I-50125 Florence, Italy; LENS, I-50125 Florence, Italy; Univ Basque Country EHU UPV, Dept Theoret Phys, E-48080 Bilbao, Spain
Abstract: We provide general bounds of phase estimation sensitivity in linear two-mode interferometers. We consider probe states with a fluctuating total number of particles. With incoherent mixtures of states with different total number of particles, particle entanglement is necessary but not sufficient to overcome the shot noise limit. The highest possible phase estimation sensitivity, the Heisenberg limit, is established under general unbiased properties of the estimator. If coherences can be created, manipulated, and detected, the Heisenberg limit can only be set in the central limit, with a sufficiently large repetition of interferometric measurements.
Giornale/Rivista: PHYSICAL REVIEW A
Volume: 91 (3) Da Pagina: 032103-1 A: 032103-15
Parole chiavi: OSSLESS BEAM SPLITTER; SU(2) SYMMETRY; QUANTUM LIMITS; ENTANGLEMENT; STATES; NOISE; STATISTICSDOI: 10.1103/PhysRevA.91.032103Citazioni: 39dati da “WEB OF SCIENCE” (of Thomson Reuters) aggiornati al: 2024-04-21Riferimenti 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