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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