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


Autoria(s): Costi, T. A.; McKenzie, Ross H.
Data(s)

01/09/2003

Resumo

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

Identificador

http://espace.library.uq.edu.au/view/UQ:13329/UQ13329_OA.pdf

http://espace.library.uq.edu.au/view/UQ:13329

Idioma(s)

eng

Publicador

Americal Physical Society

Palavras-Chave #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
Tipo

Journal Article