Demonstration of non-Markovian process characterisation and control on a quantum processor

G. A. L. White, C. D. Hill, F. A. Pollock, L. C. L. Hollenberg () and K. Modi ()
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G. A. L. White: University of Melbourne
C. D. Hill: University of Melbourne
F. A. Pollock: Monash University
L. C. L. Hollenberg: University of Melbourne
K. Modi: Monash University

Nature Communications, 2020, vol. 11, issue 1, 1-10

Abstract: Abstract In the scale-up of quantum computers, the framework underpinning fault-tolerance generally relies on the strong assumption that environmental noise affecting qubit logic is uncorrelated (Markovian). However, as physical devices progress well into the complex multi-qubit regime, attention is turning to understanding the appearance and mitigation of correlated — or non-Markovian — noise, which poses a serious challenge to the progression of quantum technology. This error type has previously remained elusive to characterisation techniques. Here, we develop a framework for characterising non-Markovian dynamics in quantum systems and experimentally test it on multi-qubit superconducting quantum devices. Where noisy processes cannot be accounted for using standard Markovian techniques, our reconstruction predicts the behaviour of the devices with an infidelity of 10−3. Our results show this characterisation technique leads to superior quantum control and extension of coherence time by effective decoupling from the non-Markovian environment. This framework, validated by our results, is applicable to any controlled quantum device and offers a significant step towards optimal device operation and noise reduction.

Date: 2020
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DOI: 10.1038/s41467-020-20113-3

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