2024-03-29T15:28:03Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/444822018-09-17T11:08:39Zcom_10261_2855com_10261_4col_10261_2857
Maximally discordant mixed states of two qubits
Galve, Fernando
Giorgi, Gian Luca
Zambrini, Roberta
PACS: 03.65.Ud, 03.67.Mn, 03.65.Ta
We study the relative strength of classical and quantum correlations, as measured by discord, for two-qubit states. Quantum correlations appear only in the presence of classical correlations, while the reverse is not always true. We identify the family of states that maximize the discord for a given value of the classical correlations and show that the largest attainable discord for mixed states is greater than for pure states. The difference between discord and entanglement is emphasized by the remarkable fact that these states do not maximize entanglement and are, in some cases, even separable. Finally, by random generation of density matrices uniformly distributed over the whole Hilbert space, we quantify the frequency of the appearance of quantum and classical correlations for different ranks.
Peer reviewed
2012-01-19T12:16:03Z
2012-01-19T12:16:03Z
2011-01-13
artÃculo
http://purl.org/coar/resource_type/c_6501
Physical Review A 83(1): 012102 (2011)
1050-2947
http://hdl.handle.net/10261/44482
10.1103/PhysRevA.83.012102
1094-1622
en
http://dx.doi.org/10.1103/PhysRevA.83.012102
open
American Physical Society