Institute of Fundamental Technological Research
Polish Academy of Sciences

Partners

Piani Marco


Recent publications
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

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.

Keywords:
resource theories, quantum entanglement, nonclassicality, quantum coherence

Affiliations:
Regula B. - other affiliation
Marco P. - other affiliation
Marco C. - other affiliation
Bromley T. - other affiliation
Streltsov A. - other affiliation
Gerardo A. - other affiliation
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

Abstract:
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.

Affiliations:
Streltsov A. - other affiliation
Gerardo A. - other affiliation
Marco P. - other affiliation
Dagmar B. - other affiliation

Category A Plus

IPPT PAN

logo ippt            Pawińskiego 5B, 02-106 Warsaw
  +48 22 826 12 81 (central)
  +48 22 826 98 15
 

Find Us

mapka
© Institute of Fundamental Technological Research Polish Academy of Sciences 2024