西班牙马德里高等研究院纳米所Enrique Burzurí团队开发了用于量子计算和自旋电子学的磁性、机械联锁卟啉–碳纳米管。相关研究成果发表在2021年11月26日出版的国际知名学术期刊《美国化学会杂志》。

原子尺度的再现性和可调性使磁性分子成为自旋量子位和自旋电子学的候选者。一个主要的挑战是将这些分子自旋植入电路几何结构中，以能够使用一个、两个或几个自旋以可控的方式进行处理。

该文介绍了碳纳米管周围机械键合的磁性卟啉二聚环的形成。机械键使卟啉磁芯与碳纳米管紧密接触，而不会干扰其结构。结合光谱技术研究表明，在形成大环和mMINT后，二聚体的磁性几何结构得以保留。此外，金属芯的选择决定了MMIT中的自旋位置。

通过测量MMITs的量子相干时间（Tm），探讨了MMITs作为量子位的适用性。二聚环的形成保留了在单体中发现的Tm，其在mMINTs中保持在μs尺度。碳纳米管被用作容器，将分子置于复杂的电路中。该策略可以推广到其他磁性分子家族。大环的大小和组成可以调整，以调节磁芯之间的磁相互作用，并为更复杂的基于分子的量子位引入磁不对称性（异金属二聚体）。

附：英文原文

Title: Magnetic, Mechanically Interlocked Porphyrin–Carbon Nanotubes for Quantum Computation and Spintronics

Author: Sara Moreno-Da Silva, Jesús I. Martínez, Aysegul Develioglu, Belén Nieto-Ortega, Leire de Juan-Fernández, Luisa Ruiz-Gonzalez, Antonio Picón, Soléne Oberli, Pablo J. Alonso, Dooshaye Moonshiram, Emilio M. Pérez, Enrique Burzurí

Issue&Volume: November 26, 2021

Abstract: Atomic-scale reproducibility and tunability endorse magnetic molecules as candidates for spin qubits and spintronics. A major challenge is to implant those molecular spins into circuit geometries that may allow one, two, or a few spins to be addressed in a controlled way. Here, the formation of mechanically bonded, magnetic porphyrin dimeric rings around carbon nanotubes (mMINTs) is presented. The mechanical bond places the porphyrin magnetic cores in close contact with the carbon nanotube without disturbing their structures. A combination of spectroscopic techniques shows that the magnetic geometry of the dimers is preserved upon formation of the macrocycle and the mMINT. Moreover, the metallic core selection determines the spin location in the mMINT. The suitability of mMINTs as qubits is explored by measuring their quantum coherence times (Tm). Formation of the dimeric ring preserves the Tm found in the monomer, which remains in the μs scale for mMINTs. The carbon nanotube is used as vessel to place the molecules in complex circuits. This strategy can be extended to other families of magnetic molecules. The size and composition of the macrocycle can be tailored to modulate magnetic interactions between the cores and to introduce magnetic asymmetries (heterometallic dimers) for more complex molecule-based qubits.

DOI: 10.1021/jacs.1c07058

Source: https://pubs.acs.org/doi/10.1021/jacs.1c07058