Investigation of high symmetry dinuclear complexes as platforms for the design of molecular two-qubit gates

Dibya Jyoti Mondal,^a Ferdous Ara,^b Stephen Hill,^b Michael Shatruk*^a

a Department of Chemistry & Biochemistry, Florida State University, Tallahassee, FL 32306, USA
b National High Magnetic Field Laboratory, Tallahassee, Florida 32310, USA

Qubits serve as fundamental units in quantum computing, enabling coherent superposition of states that can be initialized, manipulated, and read out for quantum information processing.^1-2 Molecular spin qubits hold particular appeal due to their synthetic tunability and the wide array of spin states achievable by incorporating various transition (3d) and lanthanide (4f) metal ions. Despite their advantages, the short coherence time remains a significant challenge for implementing molecular qubits in quantum computing technology.^3-4 In this work, we aim to achieve longer coherence times by synthesizing high-symmetry transition metal-lanthanide (3d-4f) complexes with integer-value total angular momentum (J). Matching the rotational symmetry axis to the ground-state doublet, generated by zero-field splitting for the 3d ions or crystal-field splitting for the 4f ions, allows realization of clock transitions – quantum gaps that open due to avoided level crossing and provide protection of qubits against magnetic noise. The incorporation of two qubits in such a molecular assembly opens a pathway to performing quantum gate operations that are required for implementation of quantum computing algorithms.

This project is supported by the DOE Energy Frontier Research Center M2QM (DESC0019330)

References:

Atzori, M.; Sessoli, R. Am. Chem. Soc. 2019, 141, 11339-11352.Gaita-Ariño, A.; Luis, F.; Hill, S.; Coronado, E. Chem. 2019, 11, 301-309. Shiddiq, M.; Komijani, D.; Duan, Y.; Gaita-Ariño, A.; Coronado, E.; Hill, S. Nature 2016, 531, 348-351.Giménez-Santamarina, S.; Cardona-Serra, S.; Clemente-Juan, J. M.; Gaita-Ariño, A.; Coronado, E. Sci. 2020, 11, 10718-10728.

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