Quantum impurity approach to a coupled qubit problem

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 t...

Full description

Saved in:
Bibliographic Details
Published in:Europhysics letters 2004, Vol.68
Main Authors: Camalet, Sebastien, Schriefl, Josef, Degiovanni, Pascal, Delduc, François
Format: Article
Language:English
Subjects:
Condensed Matter
Mesoscopic Systems and Quantum Hall Effect
Physics
Quantum Physics
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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.
ISSN:0295-5075
1286-4854
DOI:10.1209/epl/i2004-12019-1