Phase-noise protection in quantum-enhanced differential interferometry

Year: 2014

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.


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: 10.1088/1367-2630/16/11/113074

Citations: 12
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