2017/09/30 by D. Willsch, M. Nocon, F. Jin +2 · 1 citation
Physics and Astronomy · #quant-ph #physics.comp-ph
paper · pdf · doi:10.1103/physreva.96.062302
published as Phys. Rev. A 96, 062302 (2017)
arxiv created 2017/12/01 · arxiv updated 2017/12/04
In the model of gate-based quantum computation, the qubits are controlled by a sequence of quantum gates. In superconducting qubit systems, these gates can be implemented by voltage pulses. The success of implementing a particular gate can be expressed by various metrics such as the average gate fidelity, the diamond distance, and the unitarity. We analyze these metrics of gate pulses for a system of two superconducting transmon qubits coupled by a resonator, a system inspired by the architecture of the IBM Quantum Experience. The metrics are obtained by numerical solution of the time-dependent Schrödinger equation of the transmon system. We find that the metrics reflect systematic errors that are most pronounced for echoed cross-resonance gates, but that none of the studied metrics can reliably predict the performance of a gate when used repeatedly in a quantum algorithm.