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

• URL: http://arxiv.org/abs/2004.14018v2
• Date: Thu, 10 Dec 2020 00:00:02 GMT
• Title: Demonstration of non-Markovian process characterisation and control on a quantum processor
• Authors: Gregory A. L. White, Charles D. Hill, Felix A. Pollock, Lloyd C. L. Hollenberg, Kavan Modi
• Abstract summary: Non-Markovian noise poses a serious challenge to the progression of quantum technology. We develop a framework for characterising non-Markovian dynamics in quantum systems. Our results show this characterisation technique leads to superior quantum control and extension of coherence time.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• 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.

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