Quantum Secure Direct Communication (QSDC) is a distinctive protocol of quantum communication. It communicates confidential message straight through a quantum channel without a requirement of secret key and cipher-text. It is not solely useful in preventing eavesdropping throughout transmission, but additionally removes the security flaw related with storing and managing the key. Therefore, this protocol of secure communication is different from its typical equivalents and other quantum protocols. In this article, we will bring out the facts that how QSDC is different and better than other protocols of Quantum Communication. The transient details of all the protocols of Quantum communication are studied rigorously and compared with QSDC to demonstrate how QSDC is capable of overcoming the loopholes/shortcomings of alternative protocols. In this paper, protocols of QSDC to mitigate the possible threats available in practical QSDC are discussed and one of the protocol Measurement Device Independent QSDC is demonstrated along with the efficacy of results verified using quantum simulator and quantum machine. The results demonstrate its potential over other protocols of quantum communication and contribution towards empowering secure communication. With the benefits of QSDC over other protocols, it helps as mitigating technique for the possible threats available in other protocols of Quantum communication.
Quantum Secure Direct Communication (QSDC) is a distinctive protocol of quantum communication. It communicates confidential message straight through a quantum channel without a requirement of secret key and cipher-text. It is not solely useful in preventing eavesdropping throughout transmission, but additionally removes the security flaw related with storing and managing the key. Therefore, this protocol of secure communication is different from its typical equivalents and other quantum protocols. In this article, we will bring out the facts that how QSDC is different and better than other protocols of Quantum Communication. The transient details of all the protocols of Quantum communication are studied rigorously and compared with QSDC to demonstrate how QSDC is capable of overcoming the loopholes/shortcomings of alternative protocols. In this paper, protocols of QSDC to mitigate the possible threats available in practical QSDC are discussed and one of the protocol Measurement Device Independent QSDC is demonstrated along with the efficacy of results verified using quantum simulator and quantum machine. The results demonstrate its potential over other protocols of quantum communication and contribution towards empowering secure communication. With the benefits of QSDC over other protocols, it helps as mitigating technique for the possible threats available in other protocols of Quantum communication.
Quantum Secure Direct Communication (QSDC) is a distinctive protocol of quantum communication. It transmits confidential message straight through a quantum channel without the requirement of a secret key and ciphertext. It is also helpful in preventing eavesdropper during transmission. In this article, during the detailed study about QSDC, challenges faced while implementing the mitigation techniques w.r.t possible threats available in practical QSDC, have been studied and demonstrated. From the experiments and results it is observed that practical QSDC has inherent challenges. In actual quantum communication systems, flaws in measurement devices could give rise to disclosure of secret information to Eve without even being noticed. Measurement-device-independent QSDC protocol has been proposed using more than one swapping circuit as a mitigation technique. The efficacy of proposed protocol is verified using quantum simulator and quantum machine in the ideal scenario as well as possible threat scenarios. The results demonstrate its potential over other protocols of quantum communication and contribution towards enabling secure communication.
Quantum-secure communication and computation have garnered increasing attention due to their powerful search capabilities for certain complex problems and their ability to provide unconditional security. This indicates that classical cryptography, such as asymmetric ciphers based on complex mathematics, faces a significant threat from quantum algorithms. However, quantum cryptography can detect any attempt to eavesdrop on a channel. As a result, the investigation and implementation of quantum computers and quantum-secure communication networks have become essential objectives for numerous research teams. This paper provides an overview of quantum cryptography, including its development, and focuses on the theoretical aspect of quantum secure direct communication (QSDC). This helps readers understand the theoretical operating principles and gain a better understanding of the entire quantum characteristic and protocol operation in the QSDC field. QSDC enables secure communication without previously shared private keys, making it a crucial topic in quantum cryptography research. This paper provides an overview of several well-known versions of QSDC in theory, discussing their applications, challenges and potential future directions.
Communication security has to evolve to a higher plane in the face of the threat from the massive computing power of the emerging quantum computers. Quantum secure direct communication (QSDC) constitutes a promising branch of quantum communication, which is provably secure and overcomes the threat of quantum computing, whilst conveying secret messages directly via the quantum channel. In this survey, we highlight the motivation and the status of QSDC research with special emphasis on its theoretical basis and experimental verification. We will detail the associated point-to-point communication protocols and show how information is protected and transmitted. Finally, we discuss the open challenges as well as the future trends of QSDC networks, emphasizing again that QSDC is not a pure quantum key distribution (QKD) protocol, but a fully-fledged secure communication scheme.
Quantum communication has developed into various classes, including recent novel quantum secure direct communication (QSDC) schemes. The QSDC method transmits confidential information directly between parties over a quantum channel without requiring a shared private key. Even though QSDC offers improved security guarantees and reduces the possibility of security loopholes, practical applications such as secure information rates, long-distance quantum communication and networking, and integration with existing technologies still requires improvement. Meanwhile, advances in artificial intelligence (AI) and machine learning (ML) continue to revolutionize several fields, including quantum communication, which is challenging to control and maintain effectively for optimum performance. Various ML techniques have been applied to quantum communication systems to mitigate noise-induced errors, analyze communication protocols, and optimize secure key generation rates. While this represents a significant development and has the potential to address challenges facing QSDC applications, we are unaware of ML applications specifically improving QSDC systems. Due to this, we bring forward the discussion and unveil the critical need to integrate AI and ML models into QSDC to enhance security, improve fault tolerance, increase communication distance, and optimize resource allocation. Consequently, this work establishes a practical framework for unlocking the full potential of QSDC protocols and, more broadly, practical quantum communication.
Quantum secure direct communication (QSDC) enables direct message transmission over quantum channels. Loopholes involved in practical apparatus, particularly nonideal measurement devices, provide a potential interface for attacking practical quantum communication. Measurement-device–independent (MDI) QSDC protocols deal with all side-channel attacks on practical measurement devices and directly transmit secret messages over classical channels with both integrity and eavesdropper detection and prevention. We review the recent development of MDI QSDC protocols using both single photons and entangled photon pairs. These two types of MDI QSDC protocols are useful for their respective distinct characters and can be generalized to perform more interesting communication networks.
Quantum secure direct communication (QSDC) is one of the most important branches of quantum communication. In contrast to the quantum key distribution (QKD) which distributes a secure key between distant parties, QSDC directly transmits secret message instead of sharing key in advance. To establish a secure QSDC protocol, on the one hand, the security of the quantum channel should be confirmed before the exchange of the secret message. On the other hand, the quantum state should be transmitted in a quantum data block since the security of QSDC is based on the error rate analysis in the theories on statistics. Compared with the deterministic quantum key distribution (DQKD) which can also be used to transmit deterministic information, QSDC schemes do not need extra classical bits to read the secret message except for public discussion. In this article, we introduce the basic principles of QSDC and review the development in this field by introducing typical QSDC protocols chronologically. The first QSDC protocol was proposed by Long and Liu, which can be used to establish a common key between distant parties. In their scheme, the method for transmitting quantum states in a block by block way and in multiple steps was proposed and the information leakage before eavesdropping detection was solved. Subsequently, Deng et al. presented two pioneering QSDC schemes, an entangled-state-based two-step QSDC scheme and a single-photon-state-based quantum one-time pad scheme, in which the basic principle and criteria for QSDC were pointed out. From then on, many interesting QSDC schemes have been proposed, including the high-dimension QSDC scheme based on quantum superdense coding, multi-step QSDC scheme based on Greenberger-Horne-Zeilinger states, QSDC scheme based on quantum encryption with practical non-maximally entangled quantum channel, and so on. We also introduce the anti-noise QSDC schemes which were designed for coping with the collective-dephasing noise and the collective-rotation noise, respectively. In 2011, Wang et al. presented the first QSDC which exploited the hyperentangled state as the information carrier and several QSDC schemes based on the spatial degree of freedom (DOF) of photon, single-photon multi-DOF state and hyperentanglement were proposed subsequently. In addition to the point-to-point QSDC schemes, we also review the QSDC networks. Finally, a perspective of QSDC research is given in the last section.