2009 Fiscal Year Final Research Report

Construction of quantum error-correcting codes for quantum cryptography

Research Project

Project/Area Number	20760242
Research Category	Grant-in-Aid for Young Scientists (B)
Allocation Type	Single-year Grants
Research Field	Communication/Network engineering
Research Institution	Tokyo Metropolitan University
Principal Investigator	HFUJITA Hachiro Tokyo Metropolitan University, システムデザイン研究科, 助教 (30431795)
Project Period (FY)	2008 – 2009
Keywords	量子暗号 / 量子誤り訂正符号 / CSS符号
Research Abstract	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.