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

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Article number027
<mark>Journal publication date</mark>10/08/2021
<mark>Journal</mark>SciPost Physics
Volume11
Number of pages15
Publication StatusPublished
<mark>Original language</mark>English

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.