论文标题
观察合作电子量子隧道：在分子qudit中增加可访问的核态
Observation of Cooperative Electronic Quantum Tunneling: Increasing Accessible Nuclear States in a Molecular Qudit
论文作者
论文摘要
作为两级量子位（Qubits）的扩展，多级系统，所谓的Qudits（D代表Hilbert空间维度）已被预测，可以减少量子计算算法中的迭代次数。这已在众所周知的[TBPC2] 0 SMM中进行了测试，该SMM允许在单个分子单元中实现Grover算法。为了寻求具有增加可访问核自旋态数量的分子系统，我们在此探索二聚体TB2-SMM通过单晶μ-squid测量值下的二聚体温度。我们观察到具有旋转基态\ textit {j} = {\ pm} 6的电子旋转的TB（III）离子和合作量子隧穿之间的铁磁相互作用。强大的超精细结合与结核病（III）核自旋导致多种自旋逆向路径，从而在磁滞回路中产生了七个强大的超细驱动隧道步骤。我们的结果表明，可以通过电子自旋的合作隧道读取结核病（III）核自旋状态，这使二聚体TB2-SMM成为具有d = 16的出色核自旋Qudit候选者。
As an extension of two-level quantum bits (qubits), multilevel systems, so-called qudits, where d represents the Hilbert space dimension, have been predicted to reduce the number of iterations in quantum computation algorithms. This has been tested in the well-known [TbPc2]0 SMM, which allowed the implementation of the Grover algorithm in a single molecular unit. In the quest for molecular systems possessing an increased number of accessible nuclear spin states, we explore herein a dimeric Tb2-SMM via single crystal μ-SQUID measurements at sub-Kelvin temperatures. We observe ferromagnetic interactions between the Tb(III) ions and cooperative quantum tunneling of the electronic spins with spin ground state \textit{J} = {\pm}6. The strong hyperfine coupling with the Tb(III) nuclear spins leads to a multitude of spin reversal paths leading to seven strong hyperfine driven tunneling steps in the hysteresis loops. Our results show the possibility to read-out the Tb(III) nuclear spin states via the cooperative tunneling of the electronic spins, making the dimeric Tb2-SMM an excellent nuclear spin qudit candidate with d =16.
