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The laws of physics do not prohibit counterfactual communication
Physicsnpj Quantum Information

The laws of physics do not prohibit counterfactual communication

H. Salih, W. Mccutcheon, et al.

This research, conducted by Hatim Salih, Will McCutcheon, Jonte R. Hance, and John Rarity, presents a groundbreaking scheme demonstrating that counterfactual communication is possible, even involving post-selected quantum states. Through experimental validation with weak measurements and a conceptual framework of consistent histories, they achieve a remarkable fidelity approaching unity, challenging long-held assumptions in quantum communication.... show more
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Abstract
It has been conjectured that counterfactual communication is impossible, even for post-selected quantum states. 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 counterfactually 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.
Publisher
npj Quantum Information
Published On
May 18, 2022
Authors
Hatim Salih, Will McCutcheon, Jonte R. Hance, John Rarity
DOI
https://doi.org/10.1038/s41534-022-00564-w
Tags
counterfactual communicationquantum statesweak measurementsconsistent historiesfidelity
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