Superconducting persistent-current qubit

Phys. Rev. B 60, 15398 – Published 1 December 1999
T. P. Orlando, J. E. Mooij, Lin Tian, Caspar H. van der Wal, L. S. Levitov, Seth Lloyd, and J. J. Mazo

Abstract

We present the design of a superconducting qubit that has circulating currents of opposite sign as its two states. The circuit consists of three nanoscale 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 superconducting quantum interference device, and the states can be manipulated with magnetic fields. Coupled systems of qubits are also discussed as well as sources of decoherence.

DOI: http://dx.doi.org/10.1103/PhysRevB.60.15398

  • Received 13 July 1999
  • Published in the issue dated 1 December 1999

© 1999 The American Physical Society

Authors & Affiliations

T. P. Orlando

  • Department of Electrical Engineering and Computer Science, MIT, Cambridge, Massachusetts 02139

J. E. Mooij

  • Department of Electrical Engineering and Computer Science, MIT, Cambridge, Massachusetts 02139
  • Department of Applied Physics, Delft University of Technology, P.O. Box 5046, 2628 CJ Delft, The Netherlands

Lin Tian

  • Department of Physics, MIT, Cambridge, Massachusetts 02139

Caspar H. van der Wal

  • Department of Applied Physics, Delft University of Technology, P.O. Box 5046, 2628 CJ Delft, The Netherlands

L. S. Levitov

  • Department of Physics and Center for Material Science and Engineering, MIT, Cambridge, Massachusetts 02139

Seth Lloyd

  • Department of Mechanical Engineering, MIT, Cambridge, Massachusetts 02139

J. J. Mazo

  • Department of Electrical Engineering and Computer Science, MIT, Cambridge, Massachusetts 02139
  • Departamento de Física de la Materia Condensada and ICMA, CSIC–Universidad de Zaragoza, E-50009 Zaragoza, Spain

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