One-shot quantum measurement using a hysteretic DC-SQUID
Superconductivity
2009-11-10 v1 Mesoscale and Nanoscale Physics
Abstract
We propose a single shot quantum measurement to determine the state of a Josephson charge quantum bit (qubit). The qubit is a Cooper pair box (CPB) and the measuring device is a two junction superconducting quantum interference device (dc-SQUID). This coupled system exhibits a close analogy with a Rydberg atom in a high Q cavity, except that in the present device we benefit from the additional feature of escape from the supercurrent state by macroscopic quantum tunneling, which provides the final read-out. We test the feasibility of our idea against realistic experimental circuit parameters and by analyzing the phase fluctuations of the qubit.
Cite
@article{arxiv.cond-mat/0308560,
title = {One-shot quantum measurement using a hysteretic DC-SQUID},
author = {O. Buisson and F. Balestro and J. P. Pekola and F. W. J. Hekking},
journal= {arXiv preprint arXiv:cond-mat/0308560},
year = {2009}
}
Comments
4 pages, 3 figures