جستجوی مقالات مرتبط با کلیدواژه « رمزنگاری کوانتومی » در نشریات گروه « برق »

Telecommunication networks are certainly one of the cornerstones of the modern information society and one of the main drivers of the economy and provide a basis on which many daily activities can rely. Also, new technologies such as the Internet of Things, artificial intelligence, self-driving cars, 5G, etc. will not reach their full potential unless an infrastructure communication network meets their needs. Security is critical to their infrastructure and services. On the other hand, the development of quantum computing technology in recent years and the construction of quantum computers with very high processing power and solving very complex problems faster than current computers has made cybersecurity, computer security and communication devices a vital and important issue for governments. However, with the advancement of quantum technology, these threats can be prevented by using quantum methods to distribute keys, so quantum cryptography is considered as an alternative to classical methods against quantum computers and cyberattacks. Quantum key distribution is the most popular sub-branch of quantum cryptography, and commercial examples are now available in the market. However, the implementation of quantum key distribution networks in fiber optics, which is discussed in this paper, is one of the solutions that provide unconditional security through quantum cryptography to establish secure communication. The distinguishing point of this article is to provide an overview of the latest research in the field of implementation of quantum key distribution networks in fiber optics. In addition, the quantum key distribution networks implemented in the world are reviewed and compared and the approach of different countries in this field is studied.

In quantum secure dialogue, or bidirectional quantum secure direct communication, the users exchange information simultaneously and bidirectionally. In this paper, a secure quantum dialogue which is immune to collective noise has been proposed. In this schema, the data of two users is divided into three-bit sets and is transmitted using two GHZ states simultaneously. This scheme uses the entanglement swapping to produce the initial state. In this method, the eavesdropper attacks are disclosed and it has no information loss. The performance of this protocol has increased compared to previous protocols. The best efficiency of the previous protocols was 25%, but the proposed protocol reached 42.85%

Unlike classical cryptography, where security is based on computational complexity, quantum cryptography has unconditional security, which is based on physical constraints. So far, the semi-quantum version of many of the problems of secure quantum communication protocols has been proposed. In this study, we examined semi-quantum protocols that allow users to access a secret message directly without distributing the key. An important factor used to analyze the performance of secure quantum direct communication protocols is efficiency. In this study, the proposed semi-quantum secure communication protocol against various quantum attacks has been investigated. In the proposed scheme for decoding the confidential message by the receiver, a sequence of single photons is required, which is first generated by the controller. The proposed protocol has a yield of 50%, which is higher than the previous protocol, which has a yield of 66.6%.