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Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE

A discussion on a quantum key remote distribution scheme not based on the quantum entanglement state

Yu Liu, Changqiang Wang, Fan Zhang, Guangxi Zhu, Xiang Zhu

Published Apr 15, 2004• 0 citations

Abstract

Most schemes of quantum key remote distribution available mainly deal with the quantum repeater based on quantum entanglement swapping. However, as the quantum repeater has many insurmountable shortcomings, this paper, relying on the existing fairly mature technique, proposes a highly efficient QKD scheme with authentication mechanism from a new perspective of scheme not based on entanglement swapping, overcoming the low efficiency of the entanglement swapping scheme. By means of the quantum authentication mechanism, this scheme is capable of preventing and detecting any active attacks from any point in the quantum network. The scheme proposed has realized authentication and key distribution in the quantum channel at the same time, providing the authentication mechanism of this type of remote key distribution network with a reference. This paper first briefly analyzes the shortcomings of the quantum repeater scheme based on entanglement swapping and introduces the idea of highly efficient quantum key negotiation by means of the pseudo random sequence. Then a key distribution with authentication protocol based on shared secret is presented followed by a description of the application of this scheme in the quantum key distribution network.

DOI: 10.1117/12.523229

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A cross-center quantum identity authenticatin scheme was proposed.Which was based on teleportation and quantum entanglement swapping in quantum optics.In a distributed network,the proposed scheme was realized by transmitting information in quantum channel using shared EPR pairs and exchanging necessary information in classical channel at the same time.The security of this scheme,which is guaranteed by quantum mechanism,is unconditional as the EPR quantum key distribution protocol.Compare with previous schemes,the proposed scheme overcomes some disadvantages of those simple point-to-point quantum identity authentication scheme.Because of the characteristic of cross-center extending the authentication range,the proposed scheme is more flexible and practical.

Quantum key distribution (QKD) is an innovative solution in the cryptography world to prevent the information leakage that can sometimes be deliberate. Several QKD protocols were recently presented for building a secure shared key, of which the BB84 protocol is one of those interesting protocols. The authentication between the communicating parties is one of the issues that cause a huge argument. Furthermore, the current well-known QKD protocols are not yet ready to realize the personality of either the sender or the receiver, although the QKD protocol is already protected by the rules of physics and quantum mechanics to detect any interruption. This paper introduces a new QKD protocol that utilizes two quantum channels to provide authenticated communications for legitimate parties. Moreover, the proposed QKD protocol uses two type of physical behaviors, entanglement and superposition states. The entangled states are utilized to confirm the authentication between the end users, while the superposition states carry the secret key that will be shared between the users.

Quantum key distribution (QKD) is a method using some properties of quantum mechanics to create a secret shared cryptographic key even if an eavesdropper has access to unlimited computational power. All QKD protocols require that the parties have access to an authentic channel. Otherwise, QKD is vulnerable to man-in-the-middle attacks. This paper studies QKD from this point of view, emphasizing the necessity and sufficiency of using unconditionally secure authentication in QKD. In this work, a new technique of using unconditionally secure authentication is proposed for quantum cryptosystems. This technique is based on a hybrid of normal application of authentication codes and the so-called “counter-based” authentication method such that to achieve a better trade-off between security and efficiency (in terms of the required size of initially shared secret data). Based on this strategy, an authenticated version of a typical QKD protocol (the well-known BB84 protocol) is described. Some advantages of our protocol in comparison to other proposals are also highlighted.

Entanglement swapping between EPR pairs can be used to generate the same sequence of random bits in two remote places. A quantum key distribution protocol based on this idea is described. The scheme exhibits the following features: (a) It improves the rate of generated bits for transmitted qubit. (b) It allows Alice and Bob to generate a key of arbitrary length using a single quantum system (three EPR pairs), instead of a long sequence of them. (c) Detecting Eve requires the comparison of fewer bits. (d) Entanglement is an essential ingredient. The scheme assumes reliable measurements of the Bell operator.