Shin Ashley J, Zhao Changling, Shen Yi, Dickerson Claire E, Li Barry, Roshandel Hootan, Bím Daniel, Atallah Timothy L, Oyala Paul H, He Yongjia, Alson Lianne K, Kerr Tyler A, Alexandrova Anastassia N, Diaconescu Paula L, Campbell Wesley C, Caram Justin R
Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, CA 90095, USA.
Department of Physics and Astronomy, University of California, Los Angeles, Los Angeles, CA 90095, USA.
Science. 2024 Aug 9;385(6709):651-656. doi: 10.1126/science.adf7577. Epub 2024 Aug 8.
The energetic disorder induced by fluctuating liquid environments acts in opposition to the precise control required for coherence-based sensing. Overcoming fluctuations requires a protected quantum subspace that only weakly interacts with the local environment. We report a ytterbium complex that exhibited an ultranarrow absorption linewidth in solution at room temperature with a full width at half maximum of 0.625 milli-electron volts. Using spectral hole burning, we measured an even narrower linewidth of 410 pico-electron volts at 77 kelvin. Narrow linewidths allowed low-field magnetic circular dichroism at room temperature, used to sense Earth-scale magnetic fields. These results demonstrated that ligand protection in lanthanide complexes could substantially diminish electronic state fluctuations. We have termed this system an "atomlike molecular sensor" (ALMS) and proposed approaches to improve its performance.
由波动的液体环境引起的能量无序与基于相干传感所需的精确控制相悖。克服波动需要一个仅与局部环境弱相互作用的受保护量子子空间。我们报道了一种镱配合物，它在室温下的溶液中表现出超窄吸收线宽，半高宽为0.625毫电子伏特。利用光谱烧孔技术，我们在77开尔文下测量到了更窄的410皮电子伏特线宽。窄线宽使得在室温下能够进行低场磁圆二色性测量，用于探测地球规模的磁场。这些结果表明，镧系配合物中的配体保护可以显著减少电子态波动。我们将这个系统称为“类原子分子传感器”（ALMS），并提出了提高其性能的方法。
