Entanglement between a qubit and the environment in the spin-boson model

Costi, T. A. and McKenzie, Ross H. (2003) Entanglement between a qubit and the environment in the spin-boson model. Physical Review A, 68 3: 034301-1-034301-4. doi:10.1103/PhysRevA.68.034301

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Author Costi, T. A.
McKenzie, Ross H.
Title Entanglement between a qubit and the environment in the spin-boson model
Journal name Physical Review A   Check publisher's open access policy
ISSN 1050-2947
1094-1622
Publication date 2003-09-01
Sub-type Article (original research)
DOI 10.1103/PhysRevA.68.034301
Open Access Status File (Publisher version)
Volume 68
Issue 3
Start page 034301-1
End page 034301-4
Total pages 4
Place of publication College Park, MD, United States
Publisher Americal Physical Society
Collection year 2003
Language eng
Abstract The quantitative description of the quantum entanglement between a qubit and its environment is considered. Specifically, for the ground state of the spin-boson model, the entropy of entanglement of the spin is calculated as a function of α, the strength of the ohmic coupling to the environment, and ɛ, the level asymmetry. This is done by a numerical renormalization group treatment of the related anisotropic Kondo model. For ɛ=0, the entanglement increases monotonically with α, until it becomes maximal for α→1-. For fixed ɛ>0, the entanglement is a maximum as a function of α for a value, α=αM<1.
Keyword Condensed matter physics
Spin-boson model
Optics
Physics, Atomic, Molecular & Chemical
Dissipative 2-state System
Renormalization-group
Error condition detected
Josephson-junction
Magnetic-alloys
Anderson Model
Quantum-state
Dynamics
Entropy
Q-Index Code C1

 
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Created: Wed, 04 Apr 2007, 21:59:16 EST by Kaye Eldridge on behalf of School of Mathematics & Physics