PIRSA:25120020 Scientific Series Other

DOI10.48660/25120020

Series: Colloquium

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

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

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

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.

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