China Telecom and Fiberhome complete existing network test of quantum confidentiality transmission network

Recently, China Telecom Shanghai and the Research Institute, together with Fiberhome, completed the first Quantum Confidential Transmission Network (Q-OTN) live network test application in China. The test focused on verifying the encryption function and transmission performance of high-security OTN devices based on quantum key distribution technology, and the results of the common fiber transmission index and service capability tests met expectations, marking an important progress in the information security of optical transmission networks and effectively promoting quantum confidential transmission to the commercial phase of the existing network.

In recent years, information security incidents have been frequent, all parties face serious challenges, especially in government, financial, personal information security and other aspects of information security is particularly important. This Quantum Confidential Transmission Network (Q-OTN) network trial is an innovative exploration of the basic optical network overlaid with the latest information security technology by China Telecom Shanghai and China Telecom Research Institute in conjunction with Fiberhome.

Quantum key distribution (QKD) is the most practical quantum information technology, with high reliability and high security, which can effectively resist the threat of deciphering classical computing and even quantum computing, and the deep integration of QKD and OTN is a milestone achievement in the development of quantum technology and communication technology. This joint innovation program is based on the deep integration of CV-QKD and existing network OTN, which has the ultimate security experience, deep technology integration and competitive commercial promotion value, with the following three advantages.

(1) Ultimate security experience: The quantum key conforms to the national standard GM/T-0005 "Randomness Monitoring Specification", and the CV-QKD protocol has quantum security, which can resist classical splitting attacks, individual/collective attacks, coherent attacks under infinite code length/finite code length, wavelength attacks, detector saturation attacks, etc., eliminating the possibility of data leakage and bringing the ultimate security experience to customers.

2) Deep technology convergence: Create the industry's first solution for convergence of CV-QKD terminal and optical transmission equipment. The unified fiber interface enables the transmission of quantum signals and classical signals in common fiber, which enhances the spectrum utilization and saves fiber resources; the system characteristics of optical transmission equipment are used to fuse the key transmission channel and negotiation channel of QKD with classical communication channels, which greatly simplifies the external interface and reduces the security risks introduced by equipment interconnection; the unified control platform integrates OTN configuration, QKD configuration, alarm performance status, and QKD detection in one, which can be used for on-line monitoring and control. The unified control platform, which integrates OTN configuration, QKD configuration, alarm performance status and QKD detection, can view QKD code performance and trend online, and can judge the current link health status in real time by combining the relevant indicators of optical communication system, making service opening more convenient and control more intelligent, and enriching the business application scenarios of government and enterprise fine networks. The future use of optical communication in the coherent technology accumulation can be evolved to the local oscillation CV-QKD program, further reduce the size and improve the transmission performance of the one-hop 80km distance limit.

3)Competitive commercial promotion value: CV-QKD protocol can widely adopt existing optical communication common devices, including lasers and detectors, and in the future, it can also reuse existing optical module design combined with post-processing algorithms, so the cost reduction space is extremely considerable; the time delay can be visible, compared with the traditional encryption machine does not add additional time delay, supports time delay map, provides customers with more flexible and diverse key type selection and service encryption options, and can According to the demand of security level, different key types can be selected, traditional keys and quantum keys can be effectively combined to build a variety of flexible protection mechanisms, supporting different layers and different particles of encryption processing, and flexible options according to user needs; the future extension of the quantum confidentiality transmission network to the access layer will further expand the application scenarios; the next development direction: ring or more complex networking based on trusted relay, construction of quantum and The next development direction: the ring or more complex network based on trusted relay, the construction of quantum and classical key unified management of the key pool to achieve online and offline distribution, etc.

In an era when information security is being paid more and more attention, the rich types of services will further stimulate the development of quantum communication technology, which is also bound to bring new challenges to the transmission network. China Telecom will join hands with Fiberhome and other equipment manufacturers to promote the sustainable development of optical network, create a safe, reliable and best-experience bearer network, and strive to achieve the national goals of network power, digital China and network security, and work together to build a better future. We will work together to build a better future.