Non-Markovian noise that cannot be dynamically decoupled by periodic spin echo pulses

Burgarth, Daniel and Facchi, Paolo and Fraas, Martin and Hillier, Robin (2021) Non-Markovian noise that cannot be dynamically decoupled by periodic spin echo pulses. SciPost Physics, 11. ISSN 2542-4653

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Abstract

Dynamical decoupling is the leading technique to remove unwanted interactions in a vast range of quantum systems through fast rotations. But what determines the time-scale of such rotations in order to achieve good decoupling? By providing an explicit counterexample of a qubit coupled to a charged particle and magnetic monopole, we show that such time-scales cannot be decided by the decay profile induced by the noise: even though the system shows a quadratic decay (a Zeno region revealing non-Markovian noise), it cannot be decoupled by periodic spin echo pulses, no matter how fast the rotations.

Item Type:
Journal Article
Journal or Publication Title:
SciPost Physics
ID Code:
157538
Deposited By:
Deposited On:
22 Jul 2021 11:35
Refereed?:
Yes
Published?:
Published
Last Modified:
27 Sep 2021 14:27