Entanglement between a qubit and the environment in the spin-boson model
Journal Article
·
· Physical Review. A
- Institut fuer Theorie der Kondensierten Materie, Universitaet Karlsruhe, 76128 Karlsruhe, (Germany)
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 {alpha}, the strength of the ohmic coupling to the environment, and {epsilon}, the level asymmetry. This is done by a numerical renormalization group treatment of the related anisotropic Kondo model. For {epsilon}=0, the entanglement increases monotonically with {alpha}, until it becomes maximal for {alpha}{yields}1{sup -}. For fixed {epsilon}>0, the entanglement is a maximum as a function of {alpha} for a value, {alpha}={alpha}{sub M}<1.
- OSTI ID:
- 20640252
- Journal Information:
- Physical Review. A, Journal Name: Physical Review. A Journal Issue: 3 Vol. 68; ISSN 1050-2947; ISSN PLRAAN
- Country of Publication:
- United States
- Language:
- English
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