Physics – Condensed Matter
Scientific paper
2002-10-13
PRB 67, 020509(R) (2003)
Physics
Condensed Matter
4 pages, 6 figures. Slightly Revised and final accepted version
Scientific paper
10.1103/PhysRevB.67.020509
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.
Anderson James R.
Dragt Alex J.
Johnson Philip R.
Lobb C. J.
Ramos Rodrigo Contreras
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