Scientific Results

Extremal quantum correlations: experimental study with two-qubit states

Year: 2011

Authors: Chiuri A., Vallone G., Paternostro M., Mataloni P.

Autors Affiliation: Dipartimento di Fisica, Sapienza Universita di Roma, Piazzale Aldo Moro 5, I-00185 Roma, Italy;
Istituto Nazionale di Ottica (INO-CNR), L.go E. Fermi 6, I-50125 Firenze, Italy;
Museo Storico della Fisica e Centro Studi e Ricerche Enrico Fermi, Via Panisperna 89/A, Compendio del Viminale, I-00184 Roma, Italy;
Centre for Theoretical Atomic, Molecular, and Optical Physics, School of Mathematics and Physics, Queen’s University, Belfast BT7 1NN, United Kingdom

Abstract: We explore experimentally the space of two-qubit quantum-correlated mixed states, including frontier states as defined by the use of quantum discord and von Neumann entropy. Our experimental setup is flexible enough to allow for high-quality generation of a vast variety of states. We address quantitatively the relation between quantum discord and a recently suggested alternative measure of quantum correlations.

Journal/Review: PHYSICAL REVIEW A

Volume: 84 (2)      Pages from: 020304  to: 020304

More Information: We thank V. Rosati for the contributions given in realizing the experiment. MP thanks G. Adesso and D. Girolami for fruitful discussions. This work was supported by the FARI project 2010 of Sapienza Universita di Roma, and the UK EPSRC (EP/G004579/1).
DOI: 10.1103/PhysRevA.84.020304

Citations: 20
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English