The possibility of making a flux qubit on nonsuperconducting mesoscopic ballistic quasi 1D ring is discussed. We showed that such ring can be effectively reduced to a two-state system with two external control parameters. The two states carry opposite persistent currents and are coupled by tunneling which leads to a quantum superposition of states. The qubit states can be manipulated by resonant microwave pulses. The flux state of the sample can be measured by a SQUID magnetometer. Two or more qubits can be coupled by the flux the circulating currents generate. The problem of decoherence is also discussed.
@article{arxiv.cond-mat/0609134,
title = {Flux qubit on mesoscopic nonsuperconducting ring},
author = {E. Zipper and M. Kurpas and M. Szelag and J. Dajka and M. Szopa},
journal= {arXiv preprint arXiv:cond-mat/0609134},
year = {2009}
}