http://www.cnr.it/ontology/cnr/individuo/prodotto/ID314581

Phase-noise protection in quantum-enhanced differential interferometry (Articolo in rivista)

Type

Label

Phase-noise protection in quantum-enhanced differential interferometry (Articolo in rivista) (literal)

Anno

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi

Alternative label

Landini, M.; Fattori, M.; Pezze, L.; Smerzi, A. (2014)
Phase-noise protection in quantum-enhanced differential interferometry
in New journal of physics
(literal)

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Note

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INO CNR; Univ Firenze; University of Florence; Istituto Nazionale di Fisica Nucleare; QSTAR (literal)

Titolo

Phase-noise protection in quantum-enhanced differential interferometry (literal)

Abstract

Differential interferometry (DI) with two coupled sensors is a most powerful approach for precision measurements in the presence of strong phase noise. However, DI has been studied and implemented only with classical resources. Here we generalize the theory of differential interferometry to the case of entangled probe states. We demonstrate that, for perfectly correlated interferometers and in the presence of arbitrary large phase noise, sub-shot noise sensitivities-up to the Heisenberg limit-are still possible with a special class of entangled states in the ideal lossless scenario. These states belong to a decoherence free subspace where entanglement is passively protected. Our work paves the way to the full exploitation of entanglement in precision measurements. (literal)

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