In the first trial of a communication system designed to be hack-proof, China has sent a stream of quantum encryption keys from a satellite to earth. The trial marks the first time space-to-ground quantum key distribution (QKD) technology has been successful, according to the official Xinhua news agency. The laws of quantum mechanics mean that any attempt to intercept communications will introduce anomalies that can be detected immediately.
QKD uses quantum mechanics to guarantee secure communication for two parties to share secret keys for encrypting and decrypting messages. If intercepted or measured, the quantum state of the key will change, and the information will self-destruct according to the system’s designers. News of the test – detailed in the journal Nature – comes a year after China launched the world’s first quantum satellite, called Micius, and has been hailed as a milestone by reviewers.
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