Platonic dynamical decoupling sequences for interacting spin systems
Institut de Physique Nucléaire, Atomique et de Spectroscopie, CESAM, University of Liège, B-4000 Liège, Belgium
| Published: | 2025-03-12, volume 9, page 1661 |
| Editor: | Aaron Goldberg |
| Eprint: | arXiv:2409.04974v2 |
| Doi: | https://doi.org/10.22331/q-2025-03-12-1661 |
| Citation: | Quantum 9, 1661 (2025). |
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Abstract
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 well-known technique, known as dynamical decoupling, uses a carefully designed sequence of pulses applied to a quantum system, such as a spin-$j$ (which represents a qudit with $d=2j+1$ levels), to suppress the coupling Hamiltonian between the system and its environment, thereby mitigating dissipation. While dynamical decoupling of qubit systems has been widely studied, the decoupling of qudit systems has been far less explored and often involves complex sequences and operations. In this work, we design efficient decoupling sequences composed solely of global $\mathrm{SU}(2)$ rotations and based on tetrahedral, octahedral, and icosahedral point groups, which we call Platonic sequences. We extend the Majorana representation for Hamiltonians to develop a simple framework that establishes the decoupling properties of each Platonic sequence and show its effectiveness on many examples. These sequences are universal in their ability to cancel any type of interaction with the environment for single spin-$j$ with spin quantum number $j\leqslant 5/2$, and they are capable of decoupling up to $5$-body interactions in an ensemble of interacting spin-$1/2$ with only global pulses, provided that the interaction Hamiltonian has no isotropic component, with the exception of the global identity. We also discuss their inherent robustness to finite pulse duration and a wide range of pulse errors, as well as their potential application as building blocks for dynamically corrected gates.

Featured image: (a) A dynamical decoupling sequence can induce some symmetry in the resulting averaged Hamiltonian.
(b) Using the Majorana representation, a Hamiltonian $H$ can be represented by a set of constellations. A $\mathrm{SU}(2)$ transformation on $H$ has the effect of rotating its constellations.
(c) The $\mathrm{SU}(2)$ symmetries of $H$ can be identified with the rotational symmetries of its constellations.
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