Mixture of two-mode unpolarized and pure quantum light states: quantum polarization and application in quantum communication

Quantum polarization is an important property that has been extensively used for quantum communication purposes. In this work, the mixture of an unpolarized two-mode state and a two-mode pure state is analysed. This mixture is controlled by a single parameter, namely the degree of purity. The quantu...

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Published in:Journal of modern optics 2005-10, Vol.52 (15), p.2093-2103
Main Author: Viana Ramos, Rubens
Format: Article
Language:English
Subjects:
Classical and quantum physics: mechanics and fields
Exact sciences and technology
Fundamental areas of phenomenology (including applications)
Optics
Physics
Polarization
Quantum communication
Quantum information
Wave optics
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description Quantum polarization is an important property that has been extensively used for quantum communication purposes. In this work, the mixture of an unpolarized two-mode state and a two-mode pure state is analysed. This mixture is controlled by a single parameter, namely the degree of purity. The quantum polarization of the two-mode mixed state is discussed using the quantum Stokes parameters and the quantum degree of polarization. A relation between the degree of purity and the quantum degree of polarization is established. The mixture is used to model coherent light amplified by an erbium-doped fibre amplifier, which focuses the loss of polarization due to the unpolarized light resulting from spontaneous emission. Finally, the use of such a mixed state in the quantum key distribution using multiphoton pulses is analysed.
doi_str_mv 10.1080/09500340500147208
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subjects Classical and quantum physics: mechanics and fields
Exact sciences and technology
Fundamental areas of phenomenology (including applications)
Optics
Physics
Polarization
Quantum communication
Quantum information
Wave optics
title Mixture of two-mode unpolarized and pure quantum light states: quantum polarization and application in quantum communication
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