Converting multilevel nonclassicality into genuine multipartite entanglement. (26th March 2018)

• Record Type: Journal Article
• Authors: Regula, Bartosz; Piani, Marco; Cianciaruso, Marco; Bromley, Thomas R; Streltsov, Alexander; Adesso, Gerardo
• Is Part Of: New journal of physics. Volume 20:Number 3(2018:Mar.)
• Publication Date: 2018-03-26
• Subjects: resource theories -- quantum entanglement -- nonclassicality -- quantum coherence; Physics -- Periodicals; Physics; Periodicals; 530.05
• DOI: 10.1088/1367-2630/aaae9d
• Languages: English
• ISSNs: 1367-2630

Abstract

Abstract: Characterizing genuine quantum resources and determining operational rules for their manipulation are crucial steps to appraise possibilities and limitations of quantum technologies. Two such key resources are nonclassicality, manifested as quantum superposition between reference states of a single system, and entanglement, capturing quantum correlations among two or more subsystems. Here we present a general formalism for the conversion of nonclassicality into multipartite entanglement, showing that a faithful reversible transformation between the two resources is always possible within a precise resource-theoretic framework. Specializing to quantum coherence between the levels of a quantum system as an instance of nonclassicality, we introduce explicit protocols for such a mapping. We further show that the conversion relates multilevel coherence and multipartite entanglement not only qualitatively, but also quantitatively, restricting the amount of entanglement achievable in the process and in particular yielding an equality between the two resources when quantified by fidelity-based geometric measures.