1999/08/23 by T. P. Orlando, J. E. Mooji, Lin Tian +4 · 1 citation
Physics and Astronomy · #cond-mat #quant-ph
paper · pdf · doi:10.1103/physrevb.60.15398
published as Science 285, 1036 (1999) · 15 pages. Updated ref.[17]: Science 285, 1036 (1999)
arxiv created 1999/08/23 · arxiv updated 2009/11/30
We present the design of a superconducting qubit that has circulating currents of opposite sign as its two states. The circuit consists of three nano-scale aluminum Josephson junctions connected in a superconducting loop and controlled by magnetic fields. The advantages of this qubit are that it can be made insensitive to background charges in the substrate, the flux in the two states can be detected with a SQUID, and the states can be manipulated with magnetic fields. Coupled systems of qubits are also discussed as well as sources of decoherence.