Quantum Coherent Tunable Coupling of Superconducting Qubits

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Science  04 May 2007:
Vol. 316, Issue 5825, pp. 723-726
DOI: 10.1126/science.1141324

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To do large-scale quantum information processing, it is necessary to control the interactions between individual qubits while retaining quantum coherence. To this end, superconducting circuits allow for a high degree of flexibility. We report on the time-domain tunable coupling of optimally biased superconducting flux qubits. By modulating the nonlinear inductance of an additional coupling element, we parametrically induced a two-qubit transition that was otherwise forbidden. We observed an on/off coupling ratio of 19 and were able to demonstrate a simple quantum protocol.

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