Please use this identifier to cite or link to this item: http://hdl.handle.net/10553/69319
Title: From Stochastic Optics to the Wigner Formalism: The Role of the Vacuum Field in Optical Quantum Communication Experiments
Authors: Casado, Alberto
Guerra Guillén, Santiago Ramón 
Plácido Suárez, José 
UNESCO Clasification: 3311 tecnología de la instrumentación
Keywords: Parametric Down-Conversion
Representation
State
Downconversion
Fluctuations, et al
Issue Date: 2019
Journal: Atoms 
Abstract: The Wigner formalism in the Heisenberg picture constitutes a bridge that connects Quantum Optics to Stochastic Optics. The vacuum field appears explicitly in the formalism, and the wavelike aspects of light are emphasised. In addition, the zeropoint intensity as a threshold for detection is a common denominator in both theories. In this paper, after summarising the basic rules of the Wigner approach and its application to parametric down-conversion, some new results are presented that delve into the physical meaning of the zeropoint field in optical quantum communication. Specifically, the relationship between Bell-state distinguishability and the number of sets of zeropoint modes that take part in the experiment is analysed in terms of the coupling between the phases of the different fields involved and the subtraction of the zeropoint intensity at the detectors. Additionally, the connection between the compatibility theorem in quantum cryptography and zeropoint field is stressed.
URI: http://hdl.handle.net/10553/69319
ISSN: 2218-2004
DOI: 10.3390/atoms7030076
Source: Atoms [ISSN 2218-2004], v 7 (3), 76, (Agosto 2019)
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