PIRSA:25120020

Video URL

https://pirsa.org/25120020

Superposing coherent states for fun & profit

Sanders, B. (2025). Superposing coherent states for fun & profit. Perimeter Institute for Theoretical Physics. https://pirsa.org/25120020

Sanders, Barry. Superposing coherent states for fun & profit. Perimeter Institute for Theoretical Physics, Dec. 03, 2025, https://pirsa.org/25120020 

          @misc{ scivideos_PIRSA:25120020,
            doi = {10.48660/25120020},
            url = {https://pirsa.org/25120020},
            author = {Sanders, Barry},
            keywords = {Other Physics},
            language = {en},
            title = {Superposing coherent states for fun \& profit},
            publisher = {Perimeter Institute for Theoretical Physics},
            year = {2025},
            month = {dec},
            note = {PIRSA:25120020 see, \url{https://scivideos.org/pirsa/25120020}}
          }

Barry Sanders University of Calgary

Talk numberPIRSA:25120020
DOI10.48660/25120020
Source RepositoryPIRSA
Collection
Talk Type Scientific Series
Subject

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 realisations (at University of New South Wales) of superposed coherent states in a spin-7/2 Antimony nucleus in a silicon substrate.