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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… (More)

- Philip R Johnson, Frederick W Strauch, Alex J Dragt, Roberto C Ramos, C J Lobb, J R Anderson +1 other
- 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… (More)

- Frederick W Strauch, S K Dutta, Hanhee Paik, T A Palomaki, K Mitra, B K Cooper +5 others
- 2007

— Rabi oscillations have been observed in many super-conducting devices, and represent prototypical logic operations for quantum bits (qubits) in a quantum computer. We use a three-level multiphoton analysis to understand the behavior of the superconducting phase qubit (current-biased Josephson junction) at high microwave drive power. Analytical and… (More)

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