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APS » Journals » Phys. Rev. B » Volume 60 » Issue 22
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Phys. Rev. B 60, 15398–15413 (1999)

Superconducting persistent-current qubit

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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

Received 13 July 1999; published in the issue dated 1 December 1999

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.

© 1999 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.60.15398
DOI:
10.1103/PhysRevB.60.15398
PACS:
73.23.-b, 85.25.Cp, 03.67.Lx
 
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