Quantum impurity approach to a coupled qubit problem
Mesoscale and Nanoscale Physics
2009-11-10 v2 Quantum Physics
Abstract
We consider a system of two qubits at the ends of a finite length 1D cavity. This problem is mapped onto the double-Kondo model which is also shown to describe the low energy physics of a finite length quantum wire with resonant levels at its ends. At the Toulouse point the ground state energy and the average populations and correlations of the qubits or resonant levels at zero temperature are computed. These results show that the effective interactions between the qubits or resonant levels can be used to probe their associated Kondo length scale.
Cite
@article{arxiv.cond-mat/0405597,
title = {Quantum impurity approach to a coupled qubit problem},
author = {Sebastien Camalet and Josef Schriefl and Pascal Degiovanni and Francois Delduc},
journal= {arXiv preprint arXiv:cond-mat/0405597},
year = {2009}
}
Comments
New version (accepted in Europhysics Letters)