Robin Blume-Kohout: Gate Set Tomography: 2 Qubits and 10^{-5} Error Bars
0Robin Blume-Kohout (Sandia National Laboratory)
Gate Set Tomography: 2 Qubits and 10^{-5} Error Bars
QuICS Workshop on the Frontiers of Quantum Information and Computer Science (September 29, 2015)
Four years ago, there was no reliable way to characterize and debug quantum gates. Process tomography required perfectly pre-calibrated gates, while randomized benchmarking only yielded an overall error rate. Gate-set tomography (GST) emerged around 2012-13 in several variants (most notably at IBM; see PRA 87, 062119) to address this need, providing complete and calibration-free characterization of gates.
At Sandia, we have pushed the capabilities of GST well beyond these initial goals. In this talk, I’ll demonstrate our open web interface, show how we characterize gates with accuracy at the Heisenberg limit, discuss how we put error bars on the results, and present experimental GST estimates with 10^{-5} error bars. I’ll also present preliminary results of GST on 2-qubit gates, including a brief survey of the tricks we use to make it possible.