Benjamin D. Woods, Hudaiba Soomro, E. S. Joseph, Collin C. D. Frink, Robert Joynt, M. A. Eriksson, Mark Friesen
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引用次数: 0
Abstract
Engineering conduction-band valley couplings is a key challenge for Si-based spin qubits. Recent work has shown that the most reliable method for enhancing valley couplings entails adding Ge concentration oscillations to the quantum well. However, ultrashort oscillation periods are difficult to grow, while long oscillation periods do not provide useful improvements. Here, we show that the main benefits of short-wavelength oscillations can be achieved in long-wavelength structures through a second-order coupling process involving Brillouin-zone folding induced by shear strain. We finally show that such strain can be achieved through common fabrication techniques, making this an exceptionally promising system for scalable quantum computing.
导带谷耦合工程是硅基自旋量子比特面临的一个关键挑战。最近的研究表明,增强谷耦合的最可靠方法是在量子阱中加入 Ge 浓度振荡。然而,超短振荡周期难以增长,而长振荡周期也无法提供有用的改进。在这里,我们展示了短波长振荡的主要优势可以通过剪切应变诱导的布里渊区折叠的二阶耦合过程在长波长结构中实现。我们最终证明,这种应变可以通过普通制造技术实现,从而使其成为一种极具潜力的可扩展量子计算系统。
期刊介绍:
The scope of npj Quantum Information spans across all relevant disciplines, fields, approaches and levels and so considers outstanding work ranging from fundamental research to applications and technologies.