Year: 2022
Type: article
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.
Source: npj Quantum Information
Institutions: University of Bristol, Heriot-Watt University
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $3,790
Awards: Training & Skills Hub in Quantum Systems Engineering: The Quantum Enterprise Hub, From interaction-free measurement to weak values - applications and issues from quantum foundations for quantum technologies, G2065212933, G2517269668, UK Quantum Technology Hub for Quantum Communications Technologies, The EPSRC Quantum Communications Hub, G4704278824, DTP 2018-19 University of York, Engineering Photonic Quantum Technologies, G8147108951, G8825924284
OpenAlex ID: W4280500065