APS Logo

Esther Hoffman Beller Lectureship (2022): Manufacturing qubits in silicon with atomic precision

ORAL · Invited

Abstract

The realisation of a large-scale error corrected quantum computer relies on our ability to reproducibly manufacture qubits that are fast, highly coherent and stable. The promise of achieving this in a highly manufacturable platform such as silicon requires a deep understanding of the materials issues that impact device operation. In this talk I will demonstrate our progress to engineer every aspect of device behaviour in silicon with atomic precision. This will cover the use of atomic precision lithography to achieve fast, controllable exchange coupling [1], fast, high fidelity qubit initialisation and read-out [2]; low noise all epitaxial gates allowing for highly stable qubits [3]; and qubit control that provide a deep understanding of the impact of the solid-state environment [4] on qubit manufacturability and operation. I will discuss our latest results in analogue quantum simulation [5] and discuss future prospects.

–

Publication: [1] Y. He, S.K. Gorman, D. Keith, L. Kranz, J.G. Keizer, and M.Y. Simmons, "A fast (∼ns) two-qubit gate between phosphorus donor electrons in silicon", Nature 571, 371 (2019)<br><br>[2] D. Keith, M. G. House, M. B. Donnelly, T. F. Watson, B. Weber, M. Y. Simmons, "Microsecond Spin Qubit Readout with a Strong-Response Single Electron Transistor", Physical Review X 9, 041003 (2019); D. Keith, S. K. Gorman, L. Kranz, Y. He, J. G. Keizer, M. A. Broome, M. Y. Simmons, "Benchmarking high fidelity single-shot readout of semiconductor qubits", New Journal of Physics 21, 063011 (2019).<br><br>[3] L. Kranz S. K. Gorman B. Thorgrimsson Y. He D. Keith J. G. Keizer M. Y. Simmons, "Exploiting a Single-Crystal Environment to Minimize the Charge Noise on Qubits in Silicon", Advanced Materials 32, 2003361 (2020).<br><br>[4] M. Koch, J.G. Keizer, P. Pakkiam, D. Keith, M.G. House, E. Peretz, and M.Y. Simmons, "Spin read-out in atomic qubits in an all-epitaxial three-dimensional transistor", Nature Nanotechnology 14, 137 (2019 – with cover article).<br><br>[5] M. Kiczynski, S. K. Gorman, H. Geng, M. B. Donnelly, Y. Chung, Y. He, J. G. Keizer and M. Y. Simmons, "Engineering topological states in atom-based semiconductor quantum dots", paper submitted.

Presenters

  • Michelle Y Simmons

    University of New South Wales, Silicon Quantum Computing Pty Ltd., Level 2, Newton Building, UNSW Sydney, Kensington, NSW 2052, Australia; Centre of Excellence for Quantum Computation and Communication Tec

Authors

  • Michelle Y Simmons

    University of New South Wales, Silicon Quantum Computing Pty Ltd., Level 2, Newton Building, UNSW Sydney, Kensington, NSW 2052, Australia; Centre of Excellence for Quantum Computation and Communication Tec