| dc.contributor | Universidade Estadual Paulista (UNESP) | |
| dc.creator | Mendonca, Paulo E. M. F. | |
| dc.creator | Marchiolli, Marcelo A. | |
| dc.creator | Galetti, Diogenes | |
| dc.date | 2015-03-18T15:53:16Z | |
| dc.date | 2016-10-25T20:24:43Z | |
| dc.date | 2015-03-18T15:53:16Z | |
| dc.date | 2016-10-25T20:24:43Z | |
| dc.date | 2014-12-01 | |
| dc.date.accessioned | 2017-04-06T07:02:17Z | |
| dc.date.available | 2017-04-06T07:02:17Z | |
| dc.identifier | Annals Of Physics. San Diego: Academic Press Inc Elsevier Science, v. 351, p. 79-103, 2014. | |
| dc.identifier | 0003-4916 | |
| dc.identifier | http://hdl.handle.net/11449/116411 | |
| dc.identifier | http://acervodigital.unesp.br/handle/11449/116411 | |
| dc.identifier | 10.1016/j.aop.2014.08.017 | |
| dc.identifier | WOS:000346451900007 | |
| dc.identifier | http://dx.doi.org/10.1016/j.aop.2014.08.017 | |
| dc.identifier.uri | http://repositorioslatinoamericanos.uchile.cl/handle/2250/927058 | |
| dc.description | We demonstrate that for every two-qubit state there is a X-counterpart, i.e., a corresponding two-qubit X-state of same spectrum and entanglement, as measured by concurrence, negativity or relative entropy of entanglement. By parametrizing the set of two-qubit X-states and a family of unitary transformations that preserve the sparse structure of a two-qubit X-state density matrix, we obtain the parametric form of a unitary transformation that converts arbitrary two-qubit states into their X-counterparts. Moreover, we provide a semi-analytic prescription on how to set the parameters of this unitary transformation in order to preserve concurrence or negativity. We also explicitly construct a set of X-state density matrices, parametrized by their purity and concurrence, whose elements are in one-to-one correspondence with the points of the concurrence versus purity (CP) diagram for generic two-qubit states. (C) 2014 Elsevier Inc. All rights reserved. | |
| dc.language | eng | |
| dc.publisher | Elsevier B.V. | |
| dc.relation | Annals Of Physics | |
| dc.rights | info:eu-repo/semantics/closedAccess | |
| dc.subject | Entanglement | |
| dc.subject | Concurrence | |
| dc.subject | Negativity | |
| dc.subject | Relative entropy of entanglement | |
| dc.subject | X-state | |
| dc.title | Entanglement universality of two-qubit X-states | |
| dc.type | Otro | |
