L17.00010. Correcting Distortion of Base-band Exchange Pulses in Quantum Dot Qubits
Presented by: David Barnes
Repeatedly identical control waveforms are necessary for high fidelity qubit control. In triple-dot exchange-only spin qubits, full Bloch-sphere control is achieved via baseband voltage pulses alone. This makes them sensitive to the effects of pulse distortion extending from kHz to GHz frequencies. Here we present a technique to correct the known distortion of our arbitrary waveform generators. The application of this correction lead to a reduction of single qubit infidelity from 0.5% to 0.2% as measured by the “blind randomized benchmarking” protocol . Additionally, we will cover an extension to this routine where we are able to estimate and potentially correct residual pulse distortion using coherent qubit control experiments.  R. W. Andrews, et al. Nat Nanotechnol. 14, 747 (2019).
- David Barnes