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.
Cited by 1
Burgarth et al., Quantum non-Markovianity elusive to interventions
Phys. Rev. A 104, L050404 (2021) [Crossref]
Authors / Affiliations: mappings to Contributors and OrganizationsSee all Organizations.
- 1 Macquarie University
- 2 Istituto Nazionale di Fisica Nucleare / National Institute for Nuclear Physics [INFN]
- 3 Università degli Studi di Bari Aldo Moro / University of Bari Aldo Moro
- 4 Virginia Tech
- 5 Lancaster University
- Australian Research Council [ARC]
- European Commission [EC]
- Instituto Nazionale di Fisica Nucleare (INFN) (through Organization: Istituto Nazionale di Fisica Nucleare / National Institute for Nuclear Physics [INFN])