Quantum noise in the Josephson charge qubit
Mesoscale and Nanoscale Physics
2009-11-10 v1 Superconductivity
Abstract
We study decoherence of the Josephson charge qubit by measuring energy relaxation and dephasing with help of the single-shot readout. We found that the dominant energy relaxation process is a spontaneous emission induced by quantum noise coupled to the charge degree of freedom. Spectral density of the noise at high frequencies is roughly proportional to the qubit excitation energy.
Cite
@article{arxiv.cond-mat/0411216,
title = {Quantum noise in the Josephson charge qubit},
author = {O. Astafiev and Yu. A. Pashkin and Y. Nakamura and T. Yamamoto and J. S. Tsai},
journal= {arXiv preprint arXiv:cond-mat/0411216},
year = {2009}
}
Comments
Submitted to Phys. Rev. Letters