Scientific Results

Phase-sensitivity bounds for two-mode interferometers

Year: 2015

Authors: Pezze L., Hyllus P., Smerzi A.

Autors Affiliation: 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.

Journal/Review: PHYSICAL REVIEW A

Volume: 91 (3)      Pages from: 032103-1  to: 032103-15

KeyWords: OSSLESS BEAM SPLITTER; SU(2) SYMMETRY; QUANTUM LIMITS; ENTANGLEMENT; STATES; NOISE; STATISTICS
DOI: 10.1103/PhysRevA.91.032103

Citations: 26
data from “WEB OF SCIENCE” (of Thomson Reuters) are update at: 2021-10-17
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