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=Volume 2 - 2023

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, attracts a significant deal of interest as a way for further scalability of quantum computing devices. However, a nontrivial task is to experimentally achieve a gain in the efficiency of realizing quantum algorithms with qudits since higher qudit levels typically have relatively short coherence times compared to qubit states. Here we propose and experimentally demonstrate two approaches for the realization of continuous dynamical decoupling of magnetic-sensitive states with m F = ±1 for qudits encoded in optical transition of trapped 171 Yb + ions. We achieve improvement in qudit levels coherence time by the order of magnitude (more than 9 ms) without any magnetic shielding, which reveals the potential advantage of the symmetry of the 171 Yb + ion energy structure for counteracting the magnetic field noise. Our results are a step towards the realization of qudit-based algorithms using trapped ions.