Spectroscopy of capacitively coupled Josephson-junction qubits

Details Spectroscopy of capacitively coupled Josephson-junction qubits Spectroscopy of capacitively coupled Josephson-junction qubits

2002-10-13

arxiv.org/abs/cond-mat/0210278v2

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.

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