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APS » Journals » Phys. Rev. B » Volume 67 » Issue 2
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Phys. Rev. B 67, 020509(R) (2003) [4 pages]

Spectroscopy of capacitively coupled Josephson-junction qubits

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Philip R. Johnson, Frederick W. Strauch, Alex J. Dragt, Roberto C. Ramos, C. J. Lobb, J. R. Anderson, and F. C. Wellstood
Department of Physics, University of Maryland, College Park, Maryland 20742-4111

Received 8 October 2002; revised 10 December 2002; published 22 January 2003

We show that two capacitively coupled Josephson junctions, in the quantum limit, form a simple coupled qubit system with effective coupling controlled by the junction bias currents. We compute numerically the energy levels and wave functions for the system, and show how these may be tuned to make optimal qubits. The dependence of the energy levels on the parameters can be measured spectroscopically, providing an important experimental test for the presence of entangled multiqubit states in Josephson-junction based circuits.

© 2003 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.67.020509
DOI:
10.1103/PhysRevB.67.020509
PACS:
74.50.+r, 03.67.Lx, 85.25.Cp
 
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