Phase-noise protection in quantum-enhanced differential interferometry
Anno: 2014
Autori: Landini M., Fattori M., Pezzè L., Smerzi A.
Affiliazione autori: 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.
Giornale/Rivista: NEW JOURNAL OF PHYSICS
Volume: 16 Da Pagina: 113074 A: 113074
Maggiori informazioni: 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: 10.1088/1367-2630/16/11/113074Citazioni: 12dati da “WEB OF SCIENCE” (of Thomson Reuters) aggiornati al: 2024-04-21Riferimenti tratti da Isi Web of Knowledge: (solo abbonati) Link per visualizzare la scheda su IsiWeb: Clicca quiLink per visualizzare la citazioni su IsiWeb: Clicca qui