论文标题
从分子纳米磁体的二聚体中构建基于时钟变换的两分之二门
Constructing Clock-Transition-Based Two-Qubit Gates from Dimers of Molecular Nanomagnets
论文作者
论文摘要
一个好的量子必须具有足够长的连贯性时间，以便进行门操作。避免的水平穿越允许时钟过渡，其中通过过渡到外部场中波动的不敏感性增强了连贯性。由于这种不敏感性，如何在保留时钟传输行为的同时如何有效地将Qubits融合在一起并不明显。在这里，我们提出了一种使用两个耦合分子纳米磁体的异二聚体的方案，每个二聚体都在零磁场处有一个时钟过渡，其中可以使用脉冲放射线辐射来实现所有栅极操作。我们表明，鉴于二聚体中纳米磁体之间的逼真的耦合强度，可以实现良好的门保真度（$ \ sim $ 99.4 \％）。我们确定实施门的主要错误来源，并讨论如何缓解这些错误，并研究该系统成为实施量子计算协议的可行平台所需的相干时间范围。
A good qubit must have a coherence time long enough for gate operations to be performed. Avoided level crossings allow for clock transitions in which coherence is enhanced by the insensitivity of the transition to fluctuations in external fields. Because of this insensitivity, it is not obvious how to effectively couple qubits together while retaining clock-transition behavior. Here we present a scheme for using a heterodimer of two coupled molecular nanomagnets, each with a clock transition at zero magnetic field, in which all of the gate operations needed to implement one- and two-qubit gates can be implemented with pulsed radio-frequency radiation. We show that given realistic coupling strengths between the nanomagnets in the dimer, good gate fidelities ($\sim$99.4\%) can be achieved. We identify the primary sources of error in implementing gates and discuss how these may be mitigated, and investigate the range of coherence times necessary for such a system to be a viable platform for implementing quantum computing protocols.
