论文标题
硅的连贯旋转量子量子
Coherent spin qubit transport in silicon
论文作者
论文摘要
可以使用仅与他们最近的邻居相互作用的固定量子位配置容忍故障的量子处理器，但在逻辑量子的情况下以物理Qubits的大量开销为代价。通过连贯地将Qubits运输到整个芯片上，从而使直接邻居以外的连通性可以减少。在这里，我们证明了富含同位素增强的硅中的量子点之间电子自旋量子置量位的高保真相干运输。我们观察到位点间隧道状态中的量子进液，并使用Ramsey干涉法和量子状态断层扫描技术评估量子运输的影响。我们报告的极化转移保真度为99.97％，平均相干转移保真度为99.4％。我们的结果为高保真性，芯片量子信息分布提供了关键要素，如长期所设想的，增强了基于硅的旋转Qubits的缩放前景。
A fault-tolerant quantum processor may be configured using stationary qubits interacting only with their nearest neighbours, but at the cost of significant overheads in physical qubits per logical qubit. Such overheads could be reduced by coherently transporting qubits across the chip, allowing connectivity beyond immediate neighbours. Here we demonstrate high-fidelity coherent transport of an electron spin qubit between quantum dots in isotopically-enriched silicon. We observe qubit precession in the inter-site tunnelling regime and assess the impact of qubit transport using Ramsey interferometry and quantum state tomography techniques. We report a polarization transfer fidelity of 99.97% and an average coherent transfer fidelity of 99.4%. Our results provide key elements for high-fidelity, on-chip quantum information distribution, as long envisaged, reinforcing the scaling prospects of silicon-based spin qubits.
