Abstract
The Entropy Accumulation Theorem (EAT) was introduced to significantly improve the finite-size rates for device-independent quantum information processing tasks such as device-independent quantum key distribution (QKD). A natural question would be whether it also improves the rates for device-dependent QKD. In this work, we provide an affirmative answer to this question. We present new tools for applying the EAT in the device-dependent setting. We present sufficient conditions for the Markov chain conditions to hold as well as general algorithms for constructing the needed min-tradeoff function. Utilizing Dupuis' recent privacy amplification without smoothing result, we improve the key rate by optimizing the sandwiched Rényi entropy directly rather than considering the traditional smooth min-entropy. We exemplify these new tools by considering several examples including the BB84 protocol with the qubit-based version and with a realistic parametric down-conversion source, the six-state four-state protocol and a high-dimensional analog of the BB84 protocol.
Keywords
Quantum key distributionBB84Computer scienceEntropy (arrow of time)Key (lock)SmoothingMarkov chainQubitTheoretical computer scienceQuantumProtocol (science)Quantum cryptographyStatistical physicsQuantum informationQuantum mechanicsPhysicsComputer security
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Publication Info
- Year
- 2025
- Type
- article
- Volume
- 9
- Pages
- 1941-1941
- Citations
- 4
- Access
- Closed
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Cite This
I. M. George,
Thomas van Himbeeck,
Kun Fang
et al.
(2025).
Finite-Key Analysis of Quantum Key Distribution with Characterized Devices Using Entropy Accumulation.
Quantum
, 9
, 1941-1941.
https://doi.org/10.22331/q-2025-12-12-1941
Identifiers
- DOI
- 10.22331/q-2025-12-12-1941