The laws of physics do not prohibit counterfactual communication

Hatim Salih*, Will McCutcheon, Jonte R. Hance, John Rarity

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)
12 Downloads (Pure)


It has been conjectured that counterfactual communication is impossible, even for post-selected quantum particles. We strongly challenge this by proposing precisely such a counterfactual scheme where—unambiguously—none of Alice’s photons that correctly contribute to her information about Bob’s message have been to Bob. We demonstrate counterfactuality experimentally by means of weak measurements, and conceptually using consistent histories—thus simultaneously satisfying both criteria without loopholes. Importantly, the fidelity of Alice learning Bob’s bit can be made arbitrarily close to unity.

Original languageEnglish
Article number60
Journalnpj Quantum Information
Publication statusPublished - 18 May 2022

ASJC Scopus subject areas

  • Computer Science (miscellaneous)
  • Statistical and Nonlinear Physics
  • Computer Networks and Communications
  • Computational Theory and Mathematics


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