Quantum impurity approach to a coupled qubit problem

Details Quantum impurity approach to a coupled qubit problem Quantum impurity approach to a coupled qubit problem

2004-05-26

arxiv.org/abs/cond-mat/0405597v2

Europhysics Letters 68 (2004) 37

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

New version (accepted in Europhysics Letters)

Scientific paper

10.1209/epl/i2004-10219-1

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.

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