Noise and the Measurement Process for a Circular Josephson Array Qubit
Mesoscale and Nanoscale Physics
2013-05-29 v1
Abstract
We discuss a charge qubit consisting of a circular array of Josephson junctions. The two-level system we consider couples the two charge states through a higher order tunneling process thus making it possible to achieve a long relaxation time. Using the spin-boson Hamiltonian, we estimate decoherence due to ohmic as well as 1/f noise. We simulate the quantum mechanical measurement process by studing the density matrix of the qubit and a capacitively coupled single-electron transistor that measures the charge.
Cite
@article{arxiv.cond-mat/0304513,
title = {Noise and the Measurement Process for a Circular Josephson Array Qubit},
author = {Joachim Sjostrand and Anders Karlhede},
journal= {arXiv preprint arXiv:cond-mat/0304513},
year = {2013}
}
Comments
8 pages, 4 figures