dc.contributor.author | Zeng, Guo-Mo | |
dc.contributor.author | Wu, Lianao | |
dc.contributor.author | Xing, Hai-Jun | |
dc.date.accessioned | 2015-10-27T13:35:26Z | |
dc.date.available | 2015-10-27T13:35:26Z | |
dc.date.issued | 2014-09-18 | |
dc.identifier.citation | Scientific Reports 4 : (2014) // Article ID 6377 | es |
dc.identifier.issn | 2045-2322 | |
dc.identifier.uri | http://hdl.handle.net/10810/15998 | |
dc.description.abstract | A realistic quantum many-body system, characterized by a generic microscopic Hamiltonian, is accessible only through approximation methods. The mean field theories, as the simplest practices of approximation methods, commonly serve as a powerful tool, but unfortunately often violate the symmetry of the Hamiltonian. The conventional BCS theory, as an excellent mean field approach, violates the particle number conservation and completely erases quantumness characterized by concurrence and quantum discord between different modes. We restore the symmetry by using the projected BCS theory and the exact numerical solution and find that the lost quantumness is synchronously reestablished. We show that while entanglement remains unchanged with the particle numbers, quantum discord behaves as an extensive quantity with respect to the system size. Surprisingly, discord is hardly dependent on the interaction strengths. The new feature of discord offers promising applications in modern quantum technologies. | es |
dc.description.sponsorship | We are grateful to M. S. Sarandy for useful discussions. L.-A.W. acknowledges for financial support from the Basque Government (Grant No. IT472-10), the Spanish MICINN (Project No. FIS2012-36673-C03-03), and the Basque Country University UFI (Project No. 11/55-01-2013). | es |
dc.language.iso | eng | es |
dc.publisher | Nature Publishing Group | es |
dc.rights | info:eu-repo/semantics/openAccess | es |
dc.subject | qubits | es |
dc.subject | quantum information | es |
dc.title | Symmetry restoration and quantumness reestablishment | es |
dc.type | info:eu-repo/semantics/article | es |
dc.rights.holder | This work is licensed under a Creative Commons Attribution-NonCommercial-
NoDerivs 4.0 International License. The images or other third party material in
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www.nature.com/scientificreports
SCIENTIFIC REPORTS | es |
dc.relation.publisherversion | http://www.nature.com/articles/srep06377#abstract | es |
dc.identifier.doi | 10.1038/srep06377 | |
dc.departamentoes | Física teórica e historia de la ciencia | es_ES |
dc.departamentoeu | Fisika teorikoa eta zientziaren historia | es_ES |
dc.subject.categoria | MULTIDISCIPLINARY SCIENCES | |