Phase-noise protection in quantum-enhanced differential interferometry
Authors: Landini M., Fattori M., Pezzè L., Smerzi A.
Autors Affiliation: Istituto Nazionale di Ottica – CNR Via Nello Carrara 1, 50019 Sesto Fiorentino, Italy; European Laboratiry for Non-Linear spectroscopy (LENS), INFN, Sez Firenze, and Dipartimento di Fisica, Università di Firenze, Via Nello Carrara 1, 50019 Sesto Fiorentino, Italy; QSTAR largo Enrico Fermi 2, 50125 Firenze Italy
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.
Journal/Review: NEW JOURNAL OF PHYSICS
Volume: 16 Pages from: 113074 to: 113074
More Information: This work has been supported by the EU-STREP Project QIBEC and ERC StG No. 258325. LP and MF acknowledge financial support by MIUR through FIRB Project No. RBFR08H058.DOI: 10.1088/1367-2630/16/11/113074Citations: 7data from “WEB OF SCIENCE” (of Thomson Reuters) are update at: 2019-09-15References taken from IsiWeb of Knowledge: (subscribers only)Connecting to view paper tab on IsiWeb: Click hereConnecting to view citations from IsiWeb: Click here