超精细结构
化学
量子位元
旋转
自旋(空气动力学)
凝聚态物理
量子
原子物理学
物理
量子力学
热力学
作者
Krishnendu Kundu,Jessica R. K. White,Samuel A. Moehring,Jason M. Yu,Joseph W. Ziller,Filipp Furche,William J. Evans,Stephen Hill
出处
期刊:Nature Chemistry
[Springer Nature]
日期:2022-03-14
卷期号:14 (4): 392-397
被引量:31
标识
DOI:10.1038/s41557-022-00894-4
摘要
Spins in molecules are particularly attractive targets for next-generation quantum technologies, enabling chemically programmable qubits and potential for scale-up via self-assembly. Here we report the observation of one of the largest hyperfine interactions for a molecular system, Aiso = 3,467 ± 50 MHz, as well as a very large associated clock transition. This is achieved through chemical control of the degree of s-orbital mixing into the spin-bearing d orbital associated with a series of spin-½ La(II) and Lu(II) complexes. Increased s-orbital character reduces spin–orbit coupling and enhances the electron–nuclear Fermi contact interaction. Both outcomes are advantageous for quantum applications. The former reduces spin–lattice relaxation, and the latter maximizes the hyperfine interaction, which, in turn, generates a 9-GHz clock transition, leading to an increase in phase memory time from 1.0 ± 0.4 to 12 ± 1 μs for one of the Lu(II) complexes. These findings suggest strategies for the development of molecular quantum technologies, akin to trapped ion systems. The s-orbital mixing into the spin-bearing d orbital associated with a molecular Lu(II) complex is shown to both reduce spin–orbit coupling and increase electron–nuclear hyperfine interactions, which substantially improves electron spin coherence. Combined with the potential to tune interactions through coordination chemistry, it makes this system attractive for quantum information applications.
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