[APS March Meeting] Pulse optimization for error-robust control on cloud-based hardware. скачать в хорошем качестве

[APS March Meeting] Pulse optimization for error-robust control on cloud-based hardware.

In this APS March Meeting 2021 video we describe an experimental effort designing and deploying error-robust single-qubit operations on IBM Quantum hardware. In realistic circuits, coherent errors dominate default DRAG-pulse performance, manifesting as circuit errors an order of magnitude larger than suggested by randomized benchmarking. Using optimized pulses these errors are suppressed under both serial and parallel (including crosstalk) execution of single-qubit gates on multi-qubit hardware. We design numerically-optimized pulses that implement target operations and exhibit robustness to various error processes including dephasing noise, instabilities in control amplitudes, and crosstalk. Pulse optimization is performed using a flexible optimization package incorporating a device model and physically-relevant constraints (e.g. bandwidth limits on the transmission lines of the dilution refrigerator housing IBM quantum hardware). Calibration techniques to accurately deploy optimized pulses via cloud-access controls, and maximize performance gains on ‘grey-box’ hardware, are presented. Performance gains of ~10x are achieved across multiple metrics relevant to system-level performance, including achievable circuit depth, stability over time, error-rate variability across qubits, and resilience to cross-talk.