Molecular Spin Qubits Based on High-Symmetry Holmium Complexes

Miguel Gakiya-Teruya,¹ Robert Stewart,² Eduardo Hernandez,¹ Ferdous Ara,² Stephen Hill,² Michael Shatruk¹

1. Department of Chemistry and Biochemistry, Florida State University
2. Department of Physics and National High Magnetic Field Laboratory, Florida State University

Qubit is an elementary unit of quantum computing, allowing coherent superposition of states that can be initialized, manipulated, and read-out for quantum information processing. Molecular spin qubits are appealing due to their synthetic tunability and a broad range of spin states that can be incorporated by using various transition and lanthanide metal ions. The generally short coherence time, however, remains the major obstacle for implementation of molecular qubits in quantum computing technology. In this contribution, we demonstrate how this challenge can be addressed by using holmium complexes where the metal ion resides in a high-symmetry local coordination environment. We show the emergence of clock transitions both in single-ion complexes and in extended metal-organic frameworks. Finally, we discuss the prospects for the assembly of two-qubit quantum gates using the clock-transition qubits.