Endohedral Metallofullerene as Molecular High Spin Qubit: Diverse Rabi Cycles in Gd 2 @C 79 N

• Published in: Journal of the American Chemical Society 2018-01, Vol.140 (3), p.1123-1130
• Main Authors: Hu, Ziqi, Dong, Bo-Wei, Liu, Zheng, Liu, Jun-Jie, Su, Jie, Yu, Changcheng, Xiong, Jin, Shi, Di-Er, Wang, Yuanyuan, Wang, Bing-Wu, Ardavan, Arzhang, Shi, Zujin, Jiang, Shang-Da, Gao, Song
• Format: Article
• Language: English
• ISSN: 0002-7863; 1520-5126
• DOI: 10.1021/jacs.7b12170

An anisotropic high-spin qubit with long coherence time could scale the quantum system up. It has been proposed that Grover's algorithm can be implemented in such systems. Dimetallic aza[80]fullerenes M @C N (M = Y or Gd) possess an unpaired electron located between two metal ions, offering an opportunity to manipulate spin(s) protected in the cage for quantum information processing. Herein, we report the crystallographic determination of Gd @C N for the first time. This molecular magnet with a collective high-spin ground state (S = 15/2) generated by strong magnetic coupling (J = 350 ± 20 cm ) has been unambiguously validated by magnetic susceptibility experiments. Gd @C N has quantum coherence and diverse Rabi cycles, allowing arbitrary superposition state manipulation between each adjacent level. The phase memory time reaches 5 μs at 5 K by dynamic decoupling. This molecule fulfills the requirements of Grover's searching algorithm proposed by Leuenberger and Loss.