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arXiv · 2610.38762

A Luminescent Organic Triradical as an Optically Addressable Qudit

Kueyoung E. Kim·Avik Bhanja·Alistair Inglis·William K. Myers·Sam L. Bayliss·Richard H. Friend·Petri Murto
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Abstract

Luminescent molecular trityl radicals provide options for optically-addressable electron spins and are promising for quantum sensing. Here, we present a luminescent triradical comprising three trityl groups covalently attached to a central phenyl ring. We find two distinct photoluminescence bands at 633 nm and 690 nm with different temporal evolutions, which we attribute to excited quartet and doublet states respectively. The ground state quartet is 1 meV (11.5K) lower in energy than the doublet, resulting in near-equal population of doublets and quartets at room temperature. We demonstrate optically initialized spin polarization, coherent control of the ground state quartet, and optical readout. Potential for optical quantum sensing is shown via optically detected magnetic resonance at room temperature and magneto-photoluminescence up to 3% at 5 mT. This material is a candidate optically addressable molecular qudit, providing opportunities to leverage larger state spaces than qubit systems.

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Kueyoung E. Kim, Avik Bhanja, Alistair Inglis, William K. Myers, Sam L. Bayliss, Richard H. Friend, Petri Murto. 2026-10-28. A Luminescent Organic Triradical as an Optically Addressable Qudit. https://arxiv.org/abs/2610.38762

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