Please use this identifier to cite or link to this item:
http://acervodigital.unesp.br/handle/11449/129849
- Title:
- Quantum Discord for d circle times 2 Systems
- Shanghai Jiao Tong Univ
- UCL
- Zhejiang Univ Technol
- Natl Univ Singapore
- Universidade Estadual Paulista (UNESP)
- Capital Normal Univ
- Max Planck Inst Math Sci
- 2045-2322
- NSFC
- Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
- National Institute for Science and Technology of Quantum Information (INCT-IQ)
- Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
- NSFC: 11371247
- NSFC: 10901103
- NSFC: 11201427
- FAPESP: 2012/50464-0
- National Institute for Science and Technology of Quantum Information (INCT-IQ): 2008/57856-6
- CNPq: 474592/2013-8
- We present an analytical solution for classical correlation, defined in terms of linear entropy, in an arbitrary d circle times 2 system when the second subsystem is measured. We show that the optimal measurements used in the maximization of the classical correlation in terms of linear entropy, when used to calculate the quantum discord in terms of von Neumann entropy, result in a tight upper bound for arbitrary d circle times 2 systems. This bound agrees with all known analytical results about quantum discord in terms of von Neumann entropy and, when comparing it with the numerical results for 10(6) two-qubit random density matrices, we obtain an average deviation of order 10(-4). Furthermore, our results give a way to calculate the quantum discord for arbitrary n-qubit GHZ and W states evolving under the action of the amplitude damping noisy channel.
- 3-Jun-2015
- Scientific Reports. London: Nature Publishing Group, v. 5, p. 1-7, 2015.
- 1-7
- Nature Publishing Group
- http://www.nature.com/articles/srep10262
- Acesso aberto
- outro
- http://repositorio.unesp.br/handle/11449/129849
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