Published May 2010 | Version v1
Journal article Metadata-only

Non-Markovian dynamics of quantum discord

Creators

  • 1. Instituto de Fisica Gleb Wataghin, Universidade Estadual de Campinas, Post Office Box 6165, 13083-970, Campinas, SP (Brazil)
  • 2. Departamento de Fisica, Universidade Federal de Sao Carlos, Post Office Box 676, 13565-905, Sao Carlos, SP (Brazil)
  • 3. Instituto de Fisica de Sao Carlos, Universidade de Sao Paulo, Post Office Box 369, 13560-970, Sao Carlos, SP (Brazil)

Description

We evaluate the quantum discord dynamics of two qubits in independent and common non-Markovian environments. We compare the dynamics of entanglement with that of quantum discord. For independent reservoirs the quantum discord vanishes only at discrete instants whereas the entanglement can disappear during a finite time interval. For a common reservoir, quantum discord and entanglement can behave very differently with sudden birth of the former but not of the latter. Furthermore, in this case the quantum discord dynamics presents sudden changes in the derivative of its time evolution which is evidenced by the presence of kinks in its behavior at discrete instants of time.

Additional details

Identifiers

DOI
10.1103/PhysRevA.81.052107;
arXiv
arXiv:0911.1096v4;

Publishing Information

Journal Title
Physical Review. A
Journal Volume
81
Journal Issue
5
Journal Page Range
p. 052107-052107.6
ISSN
1050-2947
CODEN
PLRAAN

INIS

Country of Publication
United States
Country of Input or Organization
International Atomic Energy Agency (IAEA)
INIS RN
42001934
Subject category
S71: CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS;
Descriptors DEI
COMPARATIVE EVALUATIONS; EVOLUTION; MARKOV PROCESS; QUANTUM ENTANGLEMENT; QUBITS
Descriptors DEC
EVALUATION; INFORMATION; QUANTUM INFORMATION; STOCHASTIC PROCESSES

Optional Information

Notes
(c) 2010 The American Physical Society