Instytut Podstawowych Problemów Techniki
Polskiej Akademii Nauk


Piani Marco

Ostatnie publikacje
1.  Regula B., Marco P., Marco C., Bromley T., Streltsov A., Gerardo A., Converting multilevel nonclassicality into genuine multipartite entanglement, NEW JOURNAL OF PHYSICS, ISSN: 1367-2630, DOI: 10.1088/1367-2630/aaae9d, Vol.20, pp.033012-1-033012-13, 2018

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.

Słowa kluczowe:
resource theories, quantum entanglement, nonclassicality, quantum coherence

Afiliacje autorów:
Regula B. - inna afiliacja
Marco P. - inna afiliacja
Marco C. - inna afiliacja
Bromley T. - inna afiliacja
Streltsov A. - IPPT PAN
Gerardo A. - inna afiliacja
2.  Streltsov A., Gerardo A., Marco P., Dagmar B., Are General Quantum Correlations Monogamous?, PHYSICAL REVIEW LETTERS, ISSN: 0031-9007, DOI: 10.1103/PhysRevLett.109.050503 , Vol.109, pp.050503-1-050503-5, 2012

Quantum entanglement and quantum nonlocality are known to exhibit monogamy; that is, they obey strong constraints on how they can be distributed among multipartite systems. Quantum correlations that comprise and go beyond entanglement are quantified by, e.g., quantum discord. It was observed recently that for some states quantum discord is not monogamous. We prove, in general, that any measure of correlations that is monogamous for all states and satisfies reasonable basic properties must vanish for all
separable states: only entanglement measures can be strictly monogamous. Monogamy of other than
entanglement measures can still be satisfied for special, restricted cases: we prove that the geometric
measure of discord satisfies the monogamy inequality on all pure states of three qubits.

Afiliacje autorów:
Streltsov A. - inna afiliacja
Gerardo A. - inna afiliacja
Marco P. - inna afiliacja
Dagmar B. - inna afiliacja

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