But will it really lead to a hack-free internet? From Lee Billings at Scientific American:
In a landmark study, a team of Chinese scientists using an experimental satellite has tested quantum entanglement over unprecedented distances, beaming entangled pairs of photons to three ground stations across China—each separated by more than 1,200 kilometers. The test verifies a mysterious and long-held tenet of quantum theory, and firmly establishes China as the front-runner in a burgeoning “quantum space race” to create a secure, quantum-based global communications network—that is, a potentially unhackable “quantum internet” that would be of immense geopolitical importance. The findings were published Thursday in Science.
More.
We do not live in the world we think we do. That said, probably, any system a human being can invent can be hacked by another human being. The only known exception to this is the Chinese proverb: A secret is information known to only one person.
See also: Philip Cunningham offers, Information is quantum And Everything is information.