Eur. Phys. J. B 40, 357-363 (2004)
https://doi.org/10.1140/epjb/e2004-00247-1

Current fluctuation spectrum in dissipative solid-state qubits

¹ Departamento de Teoría de la Materia Condensada, Instituto de Ciencia de Materiales de Madrid, CSIC, Cantoblanco 28049, Madrid, Spain
² Department of Physics, UMIST, P.O. Box 88, Manchester M60 1QD, UK

Corresponding author: ^a brandes@dirac.phy.umist.ac.uk

Received: 12 December 2003
Published online: 10 August 2004

Abstract

We present a formalism to calculate frequency dependent electron current noise for transport through two-level systems (such as coupled quantum dots or Cooper-pair boxes) in presence of dissipation. Perturbation theories in various regimes are formulated within a matrix scheme in Laplace scheme which we evaluate in detail both for weak and strong coupling to a bosonic environment.