Endohedral Metallofullerene as Molecular High Spin Qubit: Diverse Rabi Cycles in Gd2@C79N

Abstract

Anisotropic high spin qubit with long coherence time could scale the quantum system up. It has been proposed that the Grover’s algorithm can be implemented in such systems. Dimetallic aza[80]fullerenes M2@C79N (M=Y or Gd) possess 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 Gd2@C79N for the first time. This molecular magnet with collective high spin ground state (S = 15/2) generated by strong magnetic coupling (JGd-Rad = 350 ± 20 cm-1) have been unambiguously validated by magnetic susceptibility experiments. Gd2@C79N behaves 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 requirement of Grover’s searching algorithm proposed by Leuenberger and Loss.