Physics and Astronomy Colloquium
Precision tomography of silicon donor qubits at the threshold of fault tolerance
Presented by Robin Blume-Kohout, Sandia
On January 19, 2022, the cover of Nature announced "Silicon qubits cross key error-correction threshold for quantum computing"1. I'll explain [some of] the science behind this "Big, If True!" claim, and its context within the current explosive growth of quantum computing science and technology. In that issue of Nature, three independent papers reported broadly similar experimental demonstrations. I'll focus on one of them2, co-authored by experimentalists from UNSW (Sydney) and theorists from Sandia's Quantum Performance Lab (QPL). I'll explain the basic physics of the 3-qubit electronuclear device created at UNSW, and then I'll explain how we (the QPL) achieved complete, precise characterization of six logic gates on two donor-atom nuclear spin qubits, to demonstrate error rates below 1%.
1 https://doi.org/10.1038/d41586-022-00047-0
2 https://doi.org/10.1038/s41586-021-04292-7
3:30 pm, Friday, April 8, 2022
PAIS-1100, PAIS
Individuals with disabilities who need an auxiliary aid or service to attend or participate in P&A events should contact the Physics Department (phone: 505-277-2616, email: physics@unm.edu) well in advance to ensure your needs are accomodated. Event handouts can be provided in alternative accessible formats upon request. Please contact the Physics front office if you need written information in an alternative format.
A schedule of talks within the Department of Physics and Astronomy is available on the P&A web site at http://physics.unm.edu/pandaweb/events/index.php