Construction of quantum error-correcting codes for quantum cryptography

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Quantum cryptography cannot be broken in principle. This is a big advantage over the RSA cryptosystem that can be broken if an adversary has a powerful computer. Although quantum cryptography is secure, its key generation rate is small. The aim of this research is to construct higher key rate quantum cryptography. The research project consists of two steps. In the 1^<st> step we investigate properties and decoding of the enlarged CSS code and in the 2^<nd> step we use the results obtained in the 1^<st> step to construct a higher key rate protocol. Unfortunately, we have not yet proved the security of the protocol.