Limitations of Classical Quantum Cryptography
Quantum cryptography, usually known as Quantum Key Distribution(QKD) provides powerful security. But it has some limitations. Following no-cloning theorem, QKD only can provide 1:1 connection. So the number of links will increase N(N-1)/2 as N represents the number of nodes. If a node wants to participate into the QKD network, it will cause some issues like constructing quantum communication line. To overcome this issues, SECOQC was started.
Read more about this topic: Secure Communication Based On Quantum Cryptography
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