Quantum Logic Gates for Coupled Superconducting Phase Qubits
Frederick W. Strauch, Philip R. S. Johnson, Alex J. Dragt, C. J. Lobb, J. R. Anderson, F. C. Wellstood · Physical Review Letters · 2003
Based on a quantum analysis of two capacitively coupled current-biased Josephson junctions, we propose two fundamental two-qubit quantum logic gates. Each of these gates, when supplemented by single-qubit operations, is sufficient for universal quantum computation. Numerical solutions of the time-dependent Schrödinger equation demonstrate that these operations can be performed with good fidelity.