The germanium quantum information route

By G. Scappucci, Christoph Kloeffel, F. Zwanenburg, Daniel Loss, M. Myronov, Jianjun Zhang, S. de Franceschi, G. Katsaros, Menno Veldhorst. Nature Reviews Materials, 2020

398 citations recorded by the source corpus.

In the effort to develop disruptive quantum technologies, germanium is emerging as a versatile material to realize devices capable of encoding, processing and transmitting quantum information. These devices leverage the special properties of holes in germanium, such as their inherently strong spin–orbit coupling and their ability to host superconducting pairing correlations. In this Review, we start by introducing the physics of holes in low-dimensional germanium structures, providing key insights from a theoretical perspective. We then examine the materials-science progress underpinning germanium-based planar heterostructures and nanowires. We go on to review the most significant experimental results demonstrating key building blocks for quantum technology, such as an electrically driven universal quantum gate set with spin qubits in quantum dots and superconductor–semiconductor devices for hybrid quantum systems. We conclude by identifying the most promising avenues towards scalable quantum information processing in germanium-based systems. Germanium is a promising material to build quantum components for scalable quantum information processing. This Review examines progress in materials science and devices that has enabled key building blocks for germanium quantum technology, such as hole-spin qubits and superconductor–semiconductor hybrids.

Subfields: Atomic and Molecular Physics, and Optics, Biomedical Engineering

View Paper: https://www.semanticscholar.org/paper/08909da6b28969db9bca6a50d831ffafe85a6773

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In Atomic and Molecular Physics, and Optics

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Citations in the corpus

• Review of performance metrics of spin qubits in gated semiconducting nanostructures (2021, neutral): “[246] Giordano Scappucci, Christoph Kloeffel, Floris A.”
• Materials challenges and opportunities for quantum computing hardware (2021, background): “Harnessing the hole spin degree of freedom in Si and Ge is emerging as an attractive route in semiconductor gate-defined quantum dots (169, 193).”