We report measurements on two superconducting flux qubits coupled to a readout Superconducting QUantum Interference Device (SQUID). Two on-chip flux bias lines allow independent flux control of any two of the three elements, as illustrated by a two-dimensional qubit flux map. The application of microwaves yields a frequency-flux dispersion curve for 1- and 2-photon driving of the single-qubit excited state, and coherent manipulation of the single-qubit state results in Rabi oscillations and Ramsey fringes. This architecture should be scalable to many qubits and SQUIDs on a single chip.
@article{arxiv.cond-mat/0501679,
title = {Flux Qubits and Readout Device with Two Independent Flux Lines},
author = {B. L. T. Plourde and T. L. Robertson and P. A. Reichardt and T. Hime and S. Linzen and C. -E. Wu and John Clarke},
journal= {arXiv preprint arXiv:cond-mat/0501679},
year = {2009}
}
Comments
5 pages, 4 figures, higher quality figures available upon request. Submitted to PRL