Quantum key distribution with delayed privacy amplification and its application to security proof of a two-way deterministic protocol

Abstract

Privacy amplification (PA) is an essential post-processing step in quantum key distribution (QKD) for removing any information an eavesdropper may have on the final secret key. In this paper, we consider delaying PA of the final key after its use in one-time pad encryption and prove its security. We prove that the security and the key generation rate are not affected by delaying PA. Delaying PA has two applications: it serves as a tool for significantly simplifying the security proof of QKD with a two-way quantum channel, and also it is useful in QKD networks with trusted relays. To illustrate the power of the delayed PA idea, we use it to prove the security of a qubit-based two-way deterministic QKD protocol which uses four states and four encoding operations.

11 pages, 3 figures

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Cited by in corpus (10)

• The Evolution of Quantum Secure Direct Communication: On the Road to the Qinternet
• Post-processing of the oblivious key in quantum private queries
• Security of two-way quantum key distribution
• The Security of Quantum Key Distribution using a Simplified Trusted Relay
• Security of modified Ping-Pong protocol in noisy and lossy channel
• Two-way deterministic quantum key distribution against detector side channel attacks
• Practical security analysis of two-way quantum key distribution protocols based on non-orthogonal states
• Stream privacy amplification for quantum cryptography
• Security proof of the two-way quantum secure direct communication with channel loss and noise
• Security of deterministic key distribution with higher-dimensional systems