Year: 2025
Type: article
Abstract: Molecular electron spin qubits offer atomic-level tunability and room-temperature quantum coherence. Their integration into engineered solid-state matrices can enhance performance toward ambient quantum information technologies. Herein, we demonstrate covalent organic frameworks (COFs) as programmable matrices for stable organic radical qubits, allowing strategic optimization of spin-phonon and spin–spin interactions. Using two classic boronate-ester frameworks, COF-5 and COF-108, to host semiquinone-like radical qubits, we achieve an ultralong spin relaxation time ( T 1 > 300 μs) at 298 K, which outperforms most molecular qubits and rivals inorganic spin defects. The suppression of spin relaxation is attributed to rigid and neutral structures as well as carbon-centered spin distributions that effectively weaken spin-phonon coupling. Employing dynamical decoupling methods to both COFs improves their quantum coherence and enables room-temperature detection of nuclear spins, including 1 H, 11 B, and 13 C. Our work establishes COFs as designer quantum materials, opening new avenues for quantum sensing of nuclear spins at room temperature.
DOI: 10.1021/jacs.5c09638
Authors: Zhecheng Sun, Weibin Ni, Denan Li, Xiya Du, Aimei Zhou, Shi Liu, Lei Sun
Institution: Westlake University
Language: English
Subfield: Biophysics
Domain: Life Sciences
Open Access status: green
Award: G6991494858
OpenAlex ID: W4413421792