AUTHOR=Zalivako Ilia V. , Borisenko Alexander S. , Semerikov Ilya A. , Korolkov Andrey E. , Sidorov Pavel L. , Galstyan Kristina P. , Semenin Nikita V. , Smirnov Vasiliy N. , Aksenov Mikhail D. , Fedorov Aleksey K. , Khabarova Ksenia Yu , Kolachevsky Nikolay N. TITLE=Continuous dynamical decoupling of optical 171Yb+ qudits with radiofrequency fields JOURNAL=Frontiers in Quantum Science and Technology VOLUME=2 YEAR=2023 URL=https://www.frontiersin.org/journals/quantum-science-and-technology/articles/10.3389/frqst.2023.1228208 DOI=10.3389/frqst.2023.1228208 ISSN=2813-2181 ABSTRACT=

The use of multilevel quantum information carriers, also known as qudits, has attracted significant interest as a way of further scaling quantum computing devices. However, such multilevel systems usually express shorter coherence time than their two-level counterparts, which limits their computational potential. We thus propose and experimentally demonstrate two approaches for realizing the continuous dynamical decoupling of magnetic-sensitive states with mF = ±1 for qudits encoded in optical transition of trapped 171Yb+ ions. We improve the coherence time of qudit levels by an order of magnitude (more than 9 ms) without any magnetic shielding, revealing the potential advantage of the symmetry of the 171Yb+ ion energy structure for counteracting magnetic field noise. Our results are a step toward realizing qudit-based algorithms using trapped ions.