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Nature Communications

Room temperature quantum coherence in a potential molecular qubit

Katharina Bader, Dominik Dengler, Samuel Lenz, Burkhard Endeward, Shang‐Da Jiang, Petr Neugebauer, Joris van Slageren

Published Oct 20, 2014• 389 citations
Publisher
DOI
10.1038/ncomms6304

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Molecular qubits, owing to their designability and tunability, have emerged as fundamental units for quantum technologies. Among them, molecular qubit frameworks (MQFs) offer unique advantages in long-range ordered lattices and microporosity that provide well-defined phonon environments and guest-tunable spin dynamics. These features greatly enhance qubit performance and enable room temperature quantum operations, holding promise for quantum sensing applications. Herein, we compare the qubit performance of 2,3,6,7,10,11-hexahydroxytriphenylene (HHTP) and tetrathiafulvalene tetrabenzoic acid (H4TTFTB), which form stable radicals upon spontaneous oxidation in the air. We found that optical phonons dominate spin relaxation in HHTP, whereas H4TTFTB exhibits stronger spin-orbit coupling and higher acoustic phonon population that account for its shorter spin relaxation time. Meanwhile, H4TTFTB features a nuclear-spin-free core and in turn a prolonged phase memory time, making it a favorable qubit candidate. Furthermore, we synthesized three MQFs using H4TTFTB as the ligand, which not only retain the superior room-temperature qubit performance but also possess porous channels, establishing a viable platform for future quantum information applications.