Seminar: Superposing coherent states for fun & profit
Speaker: Professeur Barry Sanders, University of Calgary
Abstract: Coherent states conveniently represent the classically meaningful wavelike states of light, as opposed to the corpuscular number states, but superposing coherent states is mind-bogglingly unclassical, including as examples "cat states", "comb states" and "compass states". I present a history of superposing coherent states, especially for oscillators (including electromagnetic field states) and for spin, and extend to entangled coherent states. I then show that superposed coherent states are a viable path for photonic quantum computing and for reaching towards the ultimate limits of sensing. Finally, I discuss our experimental realizations (at University of New South Wales) of superposed coherent states in a spin-7/2 Antimony nucleus in a silicon substrate.
Short biography: Barry Sanders holds two Diplomas, a PhD and a DSc from Imperial College London and holds fellowships with Optica, the American Physical Society, the UK Institute of Physics and the Royal Society of Canada, and he received the 2022 City of Calgary International Achievement Award. His research is on quantum science and technology and on strategic guidance for emerging dual-use technologies. Sanders is Scientific Director of the Calgary’s “Quantum City”. In Waterloo he is a Senior Fellow with the Canadian Centre for International Governance and Innovation and a Scholar with the Balsillie School of International Affairs. Prior to returning to the University of Calgary in 2003, he was professor & Head of Physics at Macquarie University and held distinguished international visiting positions in several countries. Sanders is an expert mentor for the Creative Destruction Labs in Toronto and Calgary and advisor for CERN’s Open Quantum Institute and for the Google-GESDA quantum computing XPrize. He is co-lead of the Canada-France CNRS International Research Network, a member of quantum and nano standards bodies, a deep-tech evaluator for funding agencies and for venture funds, a member of three editorial boards, and has trained a hundred graduate students and postdocs.
Breakfast will be served!
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- 1650 Boulevard Lionel-Boulet
- Varennes, Quebec
- Canada J3X 1P7
- Room Number: Tudor Johnson
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- Co-sponsored by OPTICA-SPIE Student Chapter at INRS
- Starts 17 November 2025 05:00 AM UTC
- Ends 27 November 2025 02:00 PM UTC
- No Admission Charge