Experimental quantum tomography of a homodyne detector
Anno: 2017
Autori: Grandi S., Zavatta A., Bellini M., Paris M. G. A.
Affiliazione autori: Centre for Cold Matter, Blackett Laboratory, Imperial College London, Prince Consort Road, SW7 2AZ London, United Kingdom; Istituto Nazionale di Ottica (INO-CNR), I-50125 Florence, Italy; LENS and Department of Physics and Astronomy, University of Florence, I-50019 Sesto Fiorentino, Florence, Italy; Quantum Technology Lab, Dipartimento di Fisica, Università degli Studi di Milano, I-20133 Milano, Italy
Abstract: We suggest and demonstrate a tomographic method to characterise homodyne detectors at the quantum level. The positive operator measure associated with the detector is expanded in a quadrature basis and probed with a set of coherent states. The coefficients of the expansion are then retrieved using a least squares algorithm. Our model is general enough to describe different implementations of the homodyne setup, and it has proven capable of effectively describing the detector response to different tomographic sets. We validate the reconstructed operator measure on nonclassical states and exploit results to estimate the overall quantum efficiency of the detector.
Giornale/Rivista: NEW JOURNAL OF PHYSICS
Volume: 19 Da Pagina: 053015-1 A: 053015-12
Maggiori informazioni: This work has been supported by UniMI through the H2020 Transition Grant 15-6-3008000-625 and by MIUR under the initiative Progetto Premiale: Oltre i limiti classici di misura. SG acknowledge support by the EU under the ITN Frontiers in Quantum Technology (GA317232). MB and AZ acknowledge the support of Ente Cassa di Risparmio di Firenze.Parole chiavi: Quantum detector tomography; Quantum states of light; Quantum optics; Quantum theory; Tomography, Homodyne detector; Least squares algorithm; Nonclassical state; Positive operator measure; Quantum detectors; Quantum state; Quantum tomography; Tomographic methods, Homodyne detectionDOI: 10.1088/1367-2630/aa6f2cCitazioni: 25dati da “WEB OF SCIENCE” (of Thomson Reuters) aggiornati al: 2024-03-24Riferimenti 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