Universität zu Köln

Esposito, Martina, Randi, Francesco, Titimbo, Kelvin ORCID: 0000-0002-4700-3482, Kourousias, Georgios, Curri, Alessio, Floreanini, Roberto, Parmigiani, Fulvio, Fausti, Daniele, Zimmermann, Klaus ORCID: 0000-0003-3994-2057 and Benatti, Fabio (2016). Quantum interferences reconstruction with low homodyne detection efficiency. EPJ Quantum Technol., 3. NEW YORK: SPRINGER. ISSN 2196-0763

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Abstract

Optical homodyne tomography consists in reconstructing the quantum state of an optical field from repeated measurements of its amplitude at different field phases (homodyne data). The experimental noise, which unavoidably affects the homodyne data, leads to a detection efficiency eta < 1. The problem of reconstructing quantum states from noisy homodyne data sets prompted an intense scientific debate about the presence or absence of a lower homodyne efficiency bound (eta > 0.5) below which quantum features, like quantum interferences, cannot be retrieved. Here, by numerical experiments, we demonstrate that quantum interferences can be effectively reconstructed also for low homodyne detection efficiency. In particular, we address the challenging case of a Schrodinger cat state and test the minimax and adaptive Wigner function reconstruction technique by processing homodyne data distributed according to the chosen state but with an efficiency. < 0.5. By numerically reproducing the Schrodinger's cat interference pattern, we give evidence that quantum state reconstruction is actually possible in these conditions, and provide a guideline for handling optical tomography based on homodyne data collected by low efficiency detectors.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Esposito, Martina UNSPECIFIED UNSPECIFIED UNSPECIFIED Randi, Francesco UNSPECIFIED UNSPECIFIED UNSPECIFIED Titimbo, Kelvin UNSPECIFIED orcid.org/0000-0002-4700-3482 UNSPECIFIED Kourousias, Georgios UNSPECIFIED UNSPECIFIED UNSPECIFIED Curri, Alessio UNSPECIFIED UNSPECIFIED UNSPECIFIED Floreanini, Roberto UNSPECIFIED UNSPECIFIED UNSPECIFIED Parmigiani, Fulvio UNSPECIFIED UNSPECIFIED UNSPECIFIED Fausti, Daniele UNSPECIFIED UNSPECIFIED UNSPECIFIED Zimmermann, Klaus UNSPECIFIED orcid.org/0000-0003-3994-2057 UNSPECIFIED Benatti, Fabio UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-275971
DOI:	10.1140/epjqt/s40507-016-0045-5
Journal or Publication Title:	EPJ Quantum Technol.
Volume:	3
Date:	2016
Publisher:	SPRINGER
Place of Publication:	NEW YORK
ISSN:	2196-0763
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language LOSS-ERROR COMPENSATION; DENSITY-MATRIX; STATE; TOMOGRAPHY; LIGHT Multiple languages Quantum Science & Technology; Optics; Physics, Atomic, Molecular & Chemical Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/27597