Phase sensitivity of a Mach-Zehnder interferometer

Year: 2006

Authors: Pezzé L., Smerzi A.

Autors Affiliation: Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA; INFM, BEC, CRS, I-38050 Povo, Italy; Univ Trent, Dipartimento Fis, I-38050 Povo, Italy.

Abstract: The best performance of a Mach-Zehnder interferometer is achieved with the input state parallel to N-T/2+1 >parallel to N-T/2-1 >+parallel to N-T/2-1 >parallel to N-T/2+1 >, N-T being the total number of atoms or photons. This gives (i) a phase-shift error confidence C-68%=2.67/N-T with (ii) a single interferometric measurement. Different input quantum states can achieve the Heisenberg scaling similar to 1/N-T but with higher prefactors and at the price of a statistical analysis of two or more independent measurements.

Journal/Review: PHYSICAL REVIEW A

Volume: 73 (1)      Pages from: 11801-1  to: 11801-4

KeyWords: States; Limit; Entanglement; Noise
DOI: 10.1103/PhysRevA.73.011801

Citations: 67
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