Mach-Zehnder interferometry at the heisenberg limit with coherent and squeezed-vacuum light
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 the phase sensitivity Delta theta of a Mach-Zehnder interferometer illuminated by a coherent state in one input port and a squeezed-vacuum state in the other port is (i) independent of the true value of the phase shift and (ii) can reach the Heisenberg limit Delta theta similar to 1/N(T), where N(T) is the average number of input particles. We also demonstrate that the Cramer-Rao lower bound of phase sensitivity, Delta theta similar to 1/root|alpha|(2)e(2r)+sinh(2)r, can be saturated for arbitrary values of the squeezing parameter r and the amplitude of the coherent mode alpha by using a Bayesian phase inference protocol.
Journal/Review: PHYSICAL REVIEW LETTERS
Volume: 100 (7) Pages from: 073601 to: 073601
KeyWords: quantum interferometry; heisenberg limit; DOI: 10.1103/PhysRevLett.100.073601Citations: 235data from “WEB OF SCIENCE” (of Thomson Reuters) are update at: 2023-12-03References taken from IsiWeb of Knowledge: (subscribers only)Connecting to view paper tab on IsiWeb: Click hereConnecting to view citations from IsiWeb: Click here