论文标题
具有拓扑保护的持续性约瑟夫森相位滑动记忆单元的初步演示
Preliminary demonstration of a persistent Josephson phase-slip memory cell with topological protection
论文作者
论文摘要
超导计算有望在经典和量子方法中增强计算能力。但是，尚未实现可扩展和快速的超导记忆。在这里，我们提出了一个基于长铝纳米线Josephson连接中存在的滞后相距转变的完全超导记忆细胞。在超导环的拥抱中，记忆细胞将逻辑状态沿循环持续电流的方向编码，如在基于通量的超导记忆中所定义的那样。但是，与后者不同，此处的滞后是在长弱的链接中发生的相位滑移的结果，并且与其超导间隙的拓扑过渡相关。这种解散使我们的记忆方案与大势限制，从而实现了其微型化。此外，相滑核的强激活能提供了针对随机相滑动和磁通噪声的强大拓扑保护。这些属性使Josephson相距内存成为高级超导经典逻辑体系结构或通量码头的有前途的解决方案。
Superconducting computing promises enhanced computational power in both classical and quantum approaches. Yet, scalable and fast superconducting memories are not implemented. Here, we propose a fully superconducting memory cell based on the hysteretic phase-slip transition existing in long aluminum nanowire Josephson junctions. Embraced by a superconducting ring, the memory cell codifies the logic state in the direction of the circulating persistent current, as commonly defined in flux-based superconducting memories. But, unlike the latter, the hysteresis here is a consequence of the phase-slip occurring in the long weak link and associated to the topological transition of its superconducting gap. This disentangle our memory scheme from the large-inductance constraint, thus enabling its miniaturization. Moreover, the strong activation energy for phase-slip nucleation provides a robust topological protection against stochastic phase-slips and magnetic-flux noise. These properties make the Josephson phase-slip memory a promising solution for advanced superconducting classical logic architectures or flux qubits.
