No-Cloning Theorem

The No-Cloning Theorem is a principle in quantum physics stating that it is impossible to create an exact copy of an unknown quantum state. Unlike classical information, which can be duplicated freely, quantum information has unique properties that prevent perfect copying due to the nature of quantum superposition and measurement. This means if you try to clone a quantum state, the process will inevitably alter the original, ensuring the original and the copy cannot both be identical. This fundamental rule underpins the security of quantum communication and encryption systems.