Detection of Quantum Noise from an Electrically-Driven Two-Level System
Mesoscale and Nanoscale Physics
2009-11-10 v1
Abstract
Quantum mechanics can strongly influence the noise properties of mesoscopic devices. To probe this effect we have measured the current fluctuations at high-frequency (5-90 GHz) using a superconductor-insulator-superconductor tunnel junction as an on-chip spectrum analyser. By coupling this frequency-resolved noise detector to a quantum device we can measure the high-frequency, non-symmetrized noise as demonstrated for a Josephson junction. The same scheme is used to detect the current fluctuations arising from coherent charge oscillations in a two-level system, a superconducting charge qubit. A narrow band peak is observed in the spectral noise density at the frequency of the coherent charge oscillations.
Keywords
Cite
@article{arxiv.cond-mat/0310180,
title = {Detection of Quantum Noise from an Electrically-Driven Two-Level System},
author = {R. Deblock and E. Onac and L. Gurevich and L. P. Kouwenhoven},
journal= {arXiv preprint arXiv:cond-mat/0310180},
year = {2009}
}
Comments
16 pages, 4 figures