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Wikipedia definition
1. Quantum cryptographyQuantum cryptography describes the use of quantum mechanical effects (in particular quantum communication and quantum computation) to perform cryptographic tasks or to break cryptographic systems. The use of classical (i.e. , non-quantum) cryptography to protect against quantum attackers is also often considered as quantum cryptography (in this case, one also speaks of post-quantum cryptography).
Read “Quantum cryptography” on English Wikipedia
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