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Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)

Entanglement-based quantum key distribution with biased basis choice

Chris Erven, Xiongfeng Ma, Raymond Laflamme, Gregor Weihs

Published Jun 1, 2009• 1 citation
Publisher

Abstract

Quantum key distribution (QKD) is a maturing technology that has evolved from an abstract idea to practical systems that are even commercially available. In QKD, we have learned this the hard way, when it was realized that some devices could actually be hacked, not because the theory was wrong, but because a practical device is always much more complicated than even the most elaborate security proof. While keeping the security aspect under control, experimenters want to optimize their systems so that they can deliver the highest secure key rate possible under the conditions of a chosen quantum channel.

DOI
10.1109/cleoe-eqec.2009.5196234

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Quantum key distribution (QKD) is a maturing technology that has evolved from an abstract idea to practical systems that are even commercially available. In QKD, we have learned this the hard way, when it was realized that some devices could actually be hacked, not because the theory was wrong, but because a practical device is always much more complicated than even the most elaborate security proof. While keeping the security aspect under control, experimenters want to optimize their systems so that they can deliver the highest secure key rate possible under the conditions of a chosen quantum channel.
Quantum key distribution (QKD) is the first quantum information task to reach the level of mature technology, already fit for commercialization. It aims at the creation of a secret key between authorized partners connected by a quantum channel and a classical authenticated channel. The security of the key can in principle be guaranteed without putting any restriction on an eavesdropper's power. This article provides a concise up-to-date review of QKD, biased toward the practical side. Essential theoretical tools that have been developed to assess the security of the main experimental platforms are presented (discrete-variable, continuous-variable, and distributed-phase-reference protocols).
In theory, quantum key distribution (QKD) offers information-theoretic secure communications. In practice, however, it does not because most security proofs of QKD use assumptions that are not satisfied by the implementations, and thus their security is seriously threatened by quantum hacking. This includes, for instance, the assumption that the legitimate users of the system have a precise mathematical model to describe the behaviour of their apparatuses, that the systems are located in perfectly shielded labs which prevent any unwanted information to be leaked to the eavesdropper, and that all quantum devices and classical post-processing units are honest and follow the prescriptions of the protocol. Here, we review recent results that significantly relax these unrealistic and hardly feasible requirements, and pave the way towards achieving practical QKD with implementation security and enhanced performance.
Quantum key distribution (QKD) is a cryptographic technique that enables secure private key exchange between geographically distant parties over an insecure channel, protecting confidentiality against potential eavesdroppers. QKD has evolved significantly since its inception with the BB84 protocol proposed by Bennett and Brassard in 1984. Its theoretical foundation relies on quantum physics, particularly the uncertainty principle, the no-cloning theorem, and particle entanglement, which ensures its information-theoretic security when combined with the one-time-pad cryptographic algorithm. However, certain security loopholes persist in terms of practical implementation in commercial devices. Some vulnerabilities are associated with side-channel vectors linked to commonly used optical subcomponents, while others are more related to how existing protocols handle encoding and communication pipelines. In this work, we aim to comprehensively study the current state of security loopholes affecting QKD technology in commercial devices. We also provide a concise overview of the existing types of QKD implementations. Additionally, we offer insights into current trends and vulnerability countermeasures, paving the way for future research and novel mechanisms to enhance the implementation security of commercial QKD devices.
Abstract Most modern cryptographic mechanisms are often based on the key distribution schemes, the security of which depends on the computational complexity and the power used to break the encryption. Quantum Key Distribution (QKD) is gaining popularity as a panacea to the issue of secure key distribution due to its ability to show secret keys' information-theoretic protection that is already suitable for commercialization. The goal is to generate a secret key between trusted parties connected through a quantum channel and an authenticated classical channel. The technology promises unconditional secure communication based on the principles of quantum mechanics without limiting the power of an eavesdropper. The first three sections provide a contemporary review of the Quantum Key Distribution in a nutshell. The remaining part of the paper deals with the key parameters and implementations that have been developed to assess the security of the leading experimental platforms and the challenges with respect to the development of this technology such as optimally overlaying the logic gates via quantum-dot cellular automata, which also creates possible avenues for research in the cryptographic domain.
Quantum key distribution (QKD) is a technique to securely grow a shared secret key between two remote parties. Commercial implementations of QKD are available since 2005 and are used to secure network traffic (Fig. 1). QKD is proven unconditionally secure based on the laws of quantum physics. However, security proofs necessarily assume an idealized model of equipment. Numerous discrepancies between the model and actual hardware have been found, leading to loopholes that can be used to eavesdrop the secret key.
Quantum random number generation (QRNG) and quantum key distribution (QKD) are the first applications of quantum physics at the level of individual quanta that have matured into commercial products. Both have been commercially available for over 10 years and increasingly adopted in information security systems. Current efforts focus on standardization and certification of QRNG and QKD devices and their components in order to validate the technology and enable more widespread adoption. Since no official certification scheme specific to quantum devices has been devised so far, alternative options must be investigated. This paper describes our approaches and efforts to enable compliance of commercial QRNG and QKD network devices with security standards such as AIS 20/311 and FIPS 140-2.2