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FM: Fall Meeting

FM 39: Quantum Computation: Hardware Platforms II

FM 39.7: Talk

Dienstag, 24. September 2019, 15:45–16:00, 3044

Real-time precompensation for fast conditional sequence branching — •Bruno Küng, Yves Salathé, Niels Haandbaek, and Jan Sedivy — Zurich Instruments AG, Zurich, Switzerland

We present a real-time precompensation technology in an arbitrary waveform generator (AWG) for distortion corrections of superconducting qubit magnetic flux pulses [1].

In contrast to conventional precompensation of the waveform shape in software, real-time filtering applies corrections to the signal right before playback in the AWG. As a consequence, our implementation can incorporate the full history of the played pulse sequence, even when using fast conditional branching as is required for quantum error correction [2].

A signal level accuracy of 0.1% is achieved by optimized filter design which satisfies the requirement for low latency and enables to precompensate commonly occurring artifacts in cryogenic wiring.

For this precompensation method, the repeatability of flux pulses was quantified with two succeeding net-zero waveforms in [2]. The phase the qubits acquired during two subsequent fluxes pulses was identical within 1 deg and independent of the temporal separation between them.

[1] https://www.zhinst.com/products/hdawg/hdawg-pc

[2] M. A. Rol, et al. arXiv:1903:02492 [quant-ph], 2019