Selective decoupling in multi-level quantum systems by the SU(2) sign anomaly

TL;DR

This paper explores a novel dynamical decoupling method using 2π-pulses in multilevel quantum systems, enabling selective decoupling of specific transitions to control interactions and suppress decoherence.

Contribution

It introduces a new approach leveraging the SU(2) sign anomaly for selective decoupling in multilevel quantum systems.

Findings

Demonstrates effective selective decoupling in two-level subspaces

Provides a flexible strategy for controlling quantum network interactions

Shows potential for suppressing decoherence in quantum systems

Abstract

We investigate dynamical decoupling operated by $2\pi$-pulses in a two-level subspaces of a multilevel system showing that it may leads to selective decoupling. This provides a flexible strategy for decoupling transitions in a quantum network, when control to directly address them is not available which can be use to control internode interaction or actively suppress decoherence