Modulation of triplet quantum coherence by guest-induced structural changes in a flexible metal-organic framework

Akio Yamauchi, Saiya Fujiwara, Nobuo Kimizuka, Mizue Asada, Motoyasu Fujiwara, Toshikazu Nakamura, Jenny Pirillo, Yuh Hijikata and Nobuhiro Yanai ()
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Akio Yamauchi: Kyushu University
Saiya Fujiwara: Kyushu University
Nobuo Kimizuka: Kyushu University
Mizue Asada: Institute for Molecular Science
Motoyasu Fujiwara: Institute for Molecular Science
Toshikazu Nakamura: Institute for Molecular Science
Jenny Pirillo: Nagoya University
Yuh Hijikata: Nagoya university
Nobuhiro Yanai: Kyushu University

Nature Communications, 2024, vol. 15, issue 1, 1-9

Abstract: Abstract Quantum sensing has the potential to improve the sensitivity of chemical sensing by exploiting the characteristics of qubits, which are sensitive to the external environment. Modulation of quantum coherence by target analytes can be a useful tool for quantum sensing. Using molecular qubits is expected to provide excellent sensitivity due to the proximity of the sensor to the target analyte. However, many molecular qubits are used at cryogenic temperatures, and how to make molecular qubits respond to specific analytes remains unclear. Here, we propose a material design in which the coherence time changes in response to a variety of analytes at room temperature. We used the photoexcited triplet, which can be initialized at room temperature, as qubits and introduce them to a metal–organic framework that can flexibly change its pore structure in response to guest adsorption. By changing the local molecular density around the triplet qubits by adsorption of a specific analyte, the mobility of the triplet qubit can be changed, and the coherence time can be made responsive.

Date: 2024
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DOI: 10.1038/s41467-024-51715-w

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