We are concerned with the realization of high speed secure communication system which is an urgent desire from the data center system. It has been proved that a quantum stream cipher by Yuen 2000 protocol (so called Y-00 or ar\) has remarkable security under quantum individual attack. So it is very attractive in implementing 1 -^ 10 G bit/sec optical data center communication system. This paper introduces a system with some randomizations to reinforcement of the security in future implementation. Furthermore, we report the data transmission of 2.5 Gbit/sec in the real commercial network of 192 Km in Tokyo, and also a demonstration of High Definition Television (HDTV: 1.4 Gbit/sec) transmission of 40 Km by 2.5 Gbit/sec transceiver based on the basic model, which is immediately applicable to medical and broadcasting system.
The security issue for the next generation optical network which realizes Cloud Computing System Service with data center" is urgent problem. In such a network, the encryption by physical layer which provide super security and small delay should be employed. It must provide, however, very high speed encryption because the basic link is operated at 2.5 Gbit/sec or 10 Gbit/sec. The quantum stream cipher by Yuen-2000 protocol (Y-00) is a completely new type random cipher so called Gauss-Yuen random cipher, which can break the Shannon limit for the symmetric key cipher. We develop such a cipher which has good balance of the security, speed and cost performance. In SPIE conference on quantum communication and quantum imaging V, we reported a demonstration of 2.5 Gbit/sec system for the commercial link and proposed how to improve it to 10 Gbit/sec. This paper reports a demonstration of the Y-00 cipher system which works at 10 Gbit/sec. A transmission test in a laboratory is tried to get the basic data on what parameters are important to operate in the real commercial networks. In addition, we give some theoretical results on the security. It is clarified that the necessary condition to break the Shannon limit requires indeed the quantum phenomenon, and that the full information theoretically secure system is available in the satellite link application.
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