We extend the geometric measure of quantum discord, introduced and computed for two-qubit states, to quantify non-classical correlations in composite Gaussian states of continuous variable systems. We lay the formalism for the evaluation of a Gaussian geometric discord in two-mode Gaussian states, and present explicit formulas for the class of two-mode squeezed thermal states. In such a case, under physical constraints of bounded mean energy, geometric discord is shown to admit upper and lower bounds for a fixed value of the conventional (entropic) quantum discord. We finally discuss alternative geometric approaches to quantify Gaussian quadrature correlations. © 2011 World Scientific Publishing Company.
Gaussian geometric discord / Adesso, G.; Girolami, D.. - In: INTERNATIONAL JOURNAL OF QUANTUM INFORMATION. - ISSN 0219-7499. - 9:7-8(2011), pp. 1773-1786.
Titolo: | Gaussian geometric discord | |
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Data di pubblicazione: | 2011 | |
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Digital Object Identifier (DOI): | http://dx.doi.org/10.1142/S0219749911008192 | |
Appare nelle tipologie: | 1.1 Articolo in rivista |
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http://hdl.handle.net/11583/2849533