论文标题
在硅连贯运输过程中控制自旋Qubit的脱粒
Control of dephasing in spin qubits during coherent transport in silicon
论文作者
论文摘要
基于自旋的量子计算系统的可扩展性的关键途径之一在于在电子之间实现长距离相互作用并提高其相互连接性。连贯的自旋运输是实现这一建筑优势的最有前途的策略之一。实验结果以前已经证明了硅中两个量子点之间自旋Qubit的高保真运输,并确定了可能的误差源。在这项理论研究中,我们研究了这些误差,并分析了隧道耦合,磁场和自旋轨道影响对自旋传递过程的影响。这些效果之间的相互作用产生了双点配置,其中包括增强的逆转状态,应避免进行量子信息处理。这些结论使我们能够推断以前的实验结论并合理化大规模量子处理器的未来设计。
One of the key pathways towards scalability of spin-based quantum computing systems lies in achieving long-range interactions between electrons and increasing their inter-connectivity. Coherent spin transport is one of the most promising strategies to achieve this architectural advantage. Experimental results have previously demonstrated high fidelity transportation of spin qubits between two quantum dots in silicon and identified possible sources of error. In this theoretical study, we investigate these errors and analyze the impact of tunnel coupling, magnetic field and spin-orbit effects on the spin transfer process. The interplay between these effects gives rise to double dot configurations that include regimes of enhanced decoherence that should be avoided for quantum information processing. These conclusions permit us to extrapolate previous experimental conclusions and rationalize the future design of large scale quantum processors.