In quantum mechanics, the pigeon and the letter do not always travel together

In standard communication the pigeon always carries the message; the information is linked to a physical entity/particle. Counter to intuition, in a new counterfactual communication protocol published in NPJ Quantum Information, scientists from the University of Vienna, the University of Cambridge and the MIT have experimentally demonstrated that in quantum mechanics this is not always true, thereby contradicting a crucial premise of communication theory.

source https://www.lifetechnology.com/blogs/life-technology-news-blog/in-quantum-mechanics-the-pigeon-and-the-letter-do-not-always-travel-together