Extended Data Fig. 7: Tuning up gates between qubits.
From: A high-efficiency elementary network of interchangeable superconducting qubit devices
a, Example of a smooth pulse used to generate the swap gate. For this pulse shown, T = 160 ns, teff = 120 ns, and σ = 4 ns. Blacked dashed lines represent the effective gate time length. b, Excited state population for the right qubit as a function of consecutive gates for different effective gate times. Triangles, squares, and circles correspond to effective gate times of 139, 139.5, and 141.5 ns, respectively. Here, the 141.5 ns gate is best, as the exponential decay is indicative of least residual coherent error. c,d, excited state population for qubit 1 (red) and 2 (blue) as a function of the sideband gates applied where Ω/2π ≈ 5 MHz. Circles are data, squares are from simulation. Half-swap pulses are tuned between qubit 1 and bus, full-swap pulses between bus and qubit 2. The optimal effective sideband gate times for the left and right qubits are 52.6 ns and 101.8 ns, respectively.
