The laws of physics do not prohibit counterfactual communication
arXiv:1806.01257 · doi:10.1038/s41534-022-00564-w
Abstract
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.
Published in npj Quantum Information. Matches published version. 6 pages, 5 figures
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- Deterministic Teleportation and Universal Computation Without Particle Exchange
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- Counterfactuality, back-action, and information gain in multi-path interferometers
- Is the dynamical quantum Cheshire cat detectable?
- Quantum counterfactuality with identical particles
- Reply to "Counterfactual communication not achieved yet -- A Comment on Salih et al. (2022)"