Entanglement of two qubits coupled to an XY spin chain: Role of energy current

Journal Article · Tue Dec 15 00:00:00 EST 2009 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.80.062322· OSTI ID:21352322

Benqiong, Liu; Bin, Shao; Jian, Zou ^[1]

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1. Department of Physics, Beijing Institute of Technology, Beijing 100081 (China)

We investigate the entanglement dynamics of a two-qubit system which interacts with a Heisenberg XY spin chain constrained to carry an energy current. We show an explicit connection between the decoherence factor and entanglement, and numerically and analytically study the dynamical process of entanglement in both weak- and strong-coupling cases for two initial states, the general pure state and the mixed Werner state. We provide results that the entanglement evolution depends not only on the energy current, the anisotropy parameter and the system-environment couplings but also on the size of degrees of freedom of environment. In particular, our results imply that entanglement will be strongly suppressed by the introduction of energy current on the environmental spin chain in the weak-coupling region while it is not sensitive to the energy current in the strong-coupling region. We also observe the sudden death of entanglement in the system and show how the energy current affects the phenomenon.

• OSTI ID: 21352322
• Journal Information: Physical Review. A, Vol. 80, Issue 6; Other Information: DOI: 10.1103/PhysRevA.80.062322; (c) 2009 The American Physical Society; ISSN 1050-2947
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ANISOTROPY
COUPLING
CURRENTS
DEGREES OF FREEDOM
HEISENBERG MODEL
NUMERICAL ANALYSIS
QUANTUM COMPUTERS
QUANTUM ENTANGLEMENT
QUBITS
SPIN
STRONG-COUPLING MODEL
ANGULAR MOMENTUM
COMPUTERS
CRYSTAL MODELS
INFORMATION
MATHEMATICAL MODELS
MATHEMATICS
PARTICLE MODELS
PARTICLE PROPERTIES
QUANTUM INFORMATION