Implementation of a Toffoli Gate with Superconducting Circuits

Details Implementation of a Toffoli Gate with Superconducting Circuits Implementation of a Toffoli Gate with Superconducting Circuits

2011-08-19

arxiv.org/abs/1108.3966v2

Nature 481, 170-172 (2012)

Physics

Quantum Physics

4 pages, 5figures

Scientific paper

10.1038/nature10713

The quantum Toffoli gate allows universal reversible classical computation. It is also an important primitive in many quantum circuits and quantum error correction schemes. Here we demonstrate the realization of a Toffoli gate with three superconducting transmon qubits coupled to a microwave resonator. By exploiting the third energy level of the transmon qubit, the number of elementary gates needed for the implementation of the Toffoli gate, as well as the total gate time can be reduced significantly in comparison to theoretical proposals using two-level systems only. We characterize the performance of the gate by full process tomography and Monte Carlo process certification. The gate fidelity is found to be $68.5\pm0.5$%.

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