Yamauchi Akio, Fujiwara Saiya, Kimizuka Nobuo, Asada Mizue, Fujiwara Motoyasu, Nakamura Toshikazu, Pirillo Jenny, Hijikata Yuh, Yanai Nobuhiro
Department of Applied Chemistry, Graduate School of Engineering, Kyushu University, Fukuoka, Japan.
Center for Molecular Systems (CMS), Kyushu University, Fukuoka, Japan.
Nat Commun. 2024 Sep 2;15(1):7622. doi: 10.1038/s41467-024-51715-w.
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.
量子传感有潜力通过利用对外部环境敏感的量子比特的特性来提高化学传感的灵敏度。目标分析物对量子相干的调制可以成为量子传感的一种有用工具。由于传感器与目标分析物距离较近，使用分子量子比特有望提供出色的灵敏度。然而，许多分子量子比特是在低温下使用的，并且如何使分子量子比特对特定分析物做出响应仍不清楚。在此，我们提出一种材料设计，其中在室温下相干时间会响应各种分析物而发生变化。我们将可在室温下初始化的光激发三重态用作量子比特，并将它们引入到一种金属有机框架中，该框架可响应客体吸附而灵活改变其孔结构。通过特定分析物的吸附来改变三重态量子比特周围的局部分子密度，可以改变三重态量子比特的迁移率，并使相干时间具有响应性。
