A Luminescent Organic Triradical as an Optically Addressable Qudit
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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BibTeX
@misc{kim2026luminescent,
title = {{A Luminescent Organic Triradical as an Optically Addressable Qudit}},
author = {Kueyoung E. Kim and Avik Bhanja and Alistair Inglis and William K. Myers and Sam L. Bayliss and Richard H. Friend and Petri Murto},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.38762},
eprint = {2610.38762},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.38762},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - A Luminescent Organic Triradical as an Optically Addressable Qudit
AU - Kueyoung E. Kim
AU - Avik Bhanja
AU - Alistair Inglis
AU - William K. Myers
AU - Sam L. Bayliss
AU - Richard H. Friend
AU - Petri Murto
PY - 2026
DA - 2026/10/28
PB - arXiv
DO - 10.48550/arxiv.2610.38762
UR - https://arxiv.org/abs/2610.38762
AB - 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.
ER -