Flux qubits and readout device with two independent flux lines

作者：B. L. T. Plourde, Timothy L. Robertson, P. A. Reichardt, T. Hime, S. Linzen, C.-E. Wu, John L. Clarke · 发表于：Physical Review B · 年份：2005 · DOI：10.1103/physrevb.72.060506 · 被引用次数：80 · 研究领域：Quantum Information and Cryptography、Quantum and electron transport phenomena、Quantum Computing Algorithms and Architecture

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.