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Correlations between outcomes of random measurements

Autor(en)
Minh Cong Tran, Borivoje Dakic, Wieslaw Laskowski, Tomasz Paterek
Abstrakt

We recently showed that multipartite correlations between outcomes of random observables detect quantum entanglement in all pure and some mixed states. In this followup article we further develop this approach, derive a maximal amount of such correlations, and show that they are not monotonous under local operations and classical communication. Nevertheless, we demonstrate their usefulness in entanglement detection with a single random observable per party. Finally we study convex-roof extension of the correlations and provide a closed-form necessary and sufficient condition for entanglement in rank-2 mixed states and a witness in general.

Organisation(en)
Quantenoptik, Quantennanophysik und Quanteninformation
Externe Organisation(en)
Nanyang Technological University (NTU), University of Maryland, College Park, Österreichische Akademie der Wissenschaften (ÖAW), University of Gdańsk, National University of Singapore (NUS)
Journal
Physical Review A
Band
94
Anzahl der Seiten
9
ISSN
1050-2947
DOI
https://doi.org/10.1103/PhysRevA.94.042302
Publikationsdatum
10-2016
Peer-reviewed
Ja
ÖFOS 2012
103025 Quantenmechanik
Schlagwörter
ASJC Scopus Sachgebiete
Atomic and Molecular Physics, and Optics
Link zum Portal
https://ucrisportal.univie.ac.at/de/publications/d5ea3bad-4124-4ae3-848a-7e0737f51c91