L. Pezzé and A. Smerzi 2007 EPL 78 30004 doi:10.1209/0295-5075/78/30004
L. Pezzé and A. Smerzi
Show affiliationsInterferometry with NOON quantum states can provide unbiased phase estimation with a sensitivity scaling as Δθ ~ 1/NT given a prior knowledge that the true phase shift θ lies in the interval −π ≤ θ ≤ π. The protocol requires a total of NT = 2p−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 Schrödinger cat quantum states containing up to N = 6 beryllium ions.
Quantum gases, liquids and solids
Issue 3 (May 2007)
Received 20 November 2006, in final form 19 March 2007
Published 27 April 2007
L. Pezzé and A. Smerzi 2007 EPL 78 30004
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