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ANATOMY OF QUANTUM KEY DISTRIBUTION PROTOCOL: A COMPREHENSIVE ANALYSIS

Bhaveshkumar B. Prajapati, Nirbhay Kumar Chaubey

Published Sep 10, 2021• 0 citations
OpenAlex

Abstract

Quantum mechanics and its underlying principles assures better security then classical world which are unable to provide unconditional security. A quantum entanglement phenomenon helps us to minimize the required assumptions needs to be made about devices, resulting towards Device Independent Quantum Key Distribution (DIQKD). What about guarantying security of the QKD protocol in case of quantum devices used in protocol are untrusted? DIQKD provides unconditional security without assuming anything about internal working of quantum devices. DIQKD allows users to not focus on integrity of devices being used in protocol. Quantum physical phenomena non-local correlations and no information exchange within and between the laboratories of Alice and Bob are bases of DIQKD. As quantum computing started becoming mature and commercially viable, need for quantum error correction became obvious. Quantum error correction can be accommodated in quantum key distribution to gain better efficiency with reference to error rate. Post processing quantum error correcting techniques can remove noise once the procedure is performed. Real time quantum error correction will lead towards large scale quantum computation.

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Quantum mechanics and its underlying principles assures better security then classical world which are unable to provide unconditional security. A quantum entanglement phenomenon helps us to minimize the required assumptions needs to be made about devices, resulting towards Device Independent Quantum Key Distribution (DIQKD). What about guarantying security of the QKD protocol in case of quantum devices used in protocol are untrusted? DIQKD provides unconditional security without assuming anything about internal working of quantum devices. DIQKD allows users to not focus on integrity of devices being used in protocol. Quantum physical phenomena non-local correlations and no information exchange within and between the laboratories of Alice and Bob are bases of DIQKD. As quantum computing started becoming mature and commercially viable, need for quantum error correction became obvious. Quantum error correction can be accommodated in quantum key distribution to gain better efficiency with reference to error rate. Post processing quantum error correcting techniques can remove noise once the procedure is performed. Real time quantum error correction will lead towards large scale quantum computation.
Quantum cryptography is based on the discovery that the laws of quantum mechanics allow levels of security that are impossible to replicate in a classical world [2, 8, 12]. Can such levels of security be guaranteed even when the quantum devices on which the protocol relies are untrusted? This fundamental question in quantum cryptography dates back to the early nineties when the challenge of achieving device independent quantum key distribution, or DIQKD, was first formulated [9]. We answer this challenge affirmatively by exhibiting a robust protocol for DIQKD and rigorously proving its security. The protocol achieves a linear key rate while tolerating a constant noise rate in the devices. The security proof assumes only that the devices can be modeled by the laws of quantum mechanics and are spatially isolated from each other and any adversary's laboratory. In particular, we emphasize that the devices may have quantum memory. All previous proofs of security relied either on the use of many independent pairs of devices [6, 4, 7], or on the absence of noise [10, 1].
ABSTRACT Quantum key distribution (QKD) is based on the laws of quantum mechanics to enable provably secure communication. Despite its theoretical security promise, practical QKD systems are vulnerable to serious attacks, including side‐channel attacks and detector loopholes, and assumes a trusted device characterisation. Device‐independent quantum key distribution (DIQKD) overcomes these limitations by relying solely on observed nonlocal correlations, certified through Bell inequality violations, thereby removing assumptions about the internal workings of the measurement devices. In this paper, we first review the foundational principles underlying DIQKD, including Bell tests and security definitions. We then examine a range of protocol designs, including CHSH‐based schemes, and non‐local game frameworks, alongside with their security proofs. We also assess recent experimental implementations and discuss source architectures, detection technologies and finite‐key analyses. Finally, we identify current open problems, such as noise tolerance, generation rates and integration with quantum networks and outline promising directions for future research to realize robust high‐performance DIQKD.
Device-independent quantum key distribution (DIQKD) represents a relaxation of the security assumptions made in usual quantum key distribution (QKD). As in usual QKD, the security of DIQKD follows from the laws of quantum physics, but contrary to usual QKD, it does not rely on any assumptions about the internal working of the quantum devices used in the protocol. In this paper, we present in detail the security proof for a DIQKD protocol introduced in Acín et al (2008 Phys. Rev. Lett. 98 230501). This proof exploits the full structure of quantum theory (as opposed to other proofs that exploit only the no-signaling principle), but only holds against collective attacks, where the eavesdropper is assumed to act on the quantum systems of the honest parties independently and identically in each round of the protocol (although she can act coherently on her systems at any time). The security of any DIQKD protocol necessarily relies on the violation of a Bell inequality. We discuss the issue of loopholes in Bell experiments in this context.
Device-independent quantum key distribution (DIQKD) is a key distribution scheme whose security is based on the laws of quantum physics but does not require any assumptions about the devices used in the protocol. The security of the existing entanglement-based DIQKD protocol relies on the Bell test. Here, we propose an efficient device-independent quantum key distribution (EDIQKD) protocol in which one participant prepares states and transmits them to another participant through a quantum channel to measure. In this prepare-and-measure protocol, the transmission process between participants is characterized according to the process tomography for security, ruling out any mimicry using the classical initial, transmission, and final state. Comparing the minimal number of bits of the raw key to guarantee security against collective attacks, the efficiency of the EDIQKD protocol is two orders of magnitude more than that of the DIQKD protocol for the reliable key of which quantum bit error rate is allowed up to 6.5\%. This advantage will enable participants to substantially conserve the entangled pair's demanded resources and the measurement. According to the highest detection efficiency in the recent most advanced photonic experiment, our protocol can be realized with a non-zero key rate and remains more efficient than usual DIQKD. Our protocol and its security analysis may offer helpful insight into identifying the typical prepare-and-measure quantum information tasks with the device-independent scenario.
Quantum cryptography promises levels of security that are impossible to attain in a classical world. Can this security be guaranteed to classical users of a quantum protocol, who may not even trust the quantum devices used to implement the protocol? This central question dates back to the early 1990s when the challenge of achieving Device-Independent Quantum Key Distribution (DIQKD) was first formulated. We answer the challenge by rigorously proving the device-independent security of an entanglement-based protocol building on Ekert's original proposal for quantum key distribution. The proof of security builds on techniques from the classical theory of pseudo-randomness to achieve a new quantitative understanding of the non-local nature of quantum correlations.