A research team led by Achim Kempf has presented a method that allows cloning quantum states, something that seems to go against a pillar of quantum physics: the no-cloning theorem. The key is that the copies are generated encrypted. Only one can be decrypted and read at a time, which technically preserves the spirit of the theorem. The breakthrough has already been tested on real quantum hardware.
One-Time Encryption and Quantum Noise: The Technical Basis of the Process 🔐
The technique does not copy the pure quantum state, but generates multiple encrypted replicas. Each copy carries an associated one-time decryption key, ensuring that only one readable version can be activated. The process was inspired by the study of quantum noise, which normally degrades information, but here is harnessed in a controlled manner. This allows creating redundancy for backups without violating quantum laws.
The No-Cloning Theorem Takes a Coffee Break While They Make a Backup ☕
It seems that the no-cloning theorem, that strict guardian of quantum information, has learned to be more flexible. Now it allows making backups, but with the condition that they are under lock and key and only one can be used at a time. It's like having ten cars in the garage, but with a single key that works for all, though you can only drive one. Quantum physics also has its legal tricks.