Sub shot-noise interferometric phase sensitivity with beryllium ions Schrodinger cat states

Year: 2007

Authors: Pezzé L., Smerzi A.

Autors Affiliation: CNR-INFM BEC Center and Dipartimento di Fisica – Università di Trento, I-38050 Povo, Italy

Abstract: Interferometry with NOON quantum states can provide unbiased phase estimation with a sensitivity scaling as Delta theta similar to 1/ N(T) given a prior knowledge that the true phase shift theta lies in the interval -pi <= theta <= pi. The protocol requires a total of N(T) = 2(p) - 1 particles ( unequally) distributed among p independent measurements and overcomes basic difficulties present in previously proposed approaches. We demonstrate the possibility to obtain a phase sensitivity beating the classical shot-noise limit using published probabilities retrieved experimentally for the creation of Schrodinger cat quantum states containing up to N = 6 beryllium ions. Copyright (C) EPLA, 2007. Journal/Review: EPL

Volume: 78 (3)      Pages from: 30004  to: 30004

KeyWords: interferometry; heisenberg limit;
DOI: 10.1209/0295-5075/78/30004

Citations: 26
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