Bonn 2025 – scientific programme

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QI: Fachverband Quanteninformation

QI 34: Quantum Control I

QI 34.6: Talk

Thursday, March 13, 2025, 15:45–16:00, HS II

Platonic dynamical decoupling for multi-spin systems — •Colin Read, Eduardo Serrano-Ensástiga, and John Martin — University of Liège, Liège, Belgium

In the NISQ era, where quantum information processing is hindered by the decoherence and dissipation of elementary quantum systems, developing new protocols to extend the lifetime of quantum states is of considerable practical and theoretical importance. A prominent method, called dynamical decoupling, uses a carefully designed sequence of pulses applied to a quantum system, such as a qudit, to suppress the coupling Hamiltonian between the system and its environment, thereby mitigating dissipation.

In this work, we design decoupling sequences composed solely of SU(2) operations and based on the tetrehedral, octahedral and icosahedral point groups, which we call Platonic sequences. We use a generalization of the Majorana representation for operators to develop a simple framework for establishing the decoupling properties of each sequence, whose potential application is demonstrated for many relevant quantum systems, such as spin ensembles and large atomic spins, and which are highly robust to both finite-duration pulses and systematic control errors.

Keywords: dynamical decoupling; majorana representation; decoherence