Experimental Measurement-Device-Independent Quantum Key distribution with Flawed State-Preparation over 300 km
arXiv:2610.11428 · doi:10.1140/epjqt/s40507-025-00408-4
Abstract
Quantum key distribution (QKD) promises theoretically secure communication. However, it encounters challenges in implementation security and performance due to inevitable device imperfections. Since the proposal of measurement-device-independent (MDI) QKD, the critical step toward practical security is to secure QKD with imperfect sources. The source imperfections manifest as state-preparation uncertainty (SPU) in various aspects, e.g., encoding uncertainty, intensity fluctuation, and imperfect vacuum states. Here, we perform an MDI-QKD experiment and achieve both high practical security and superior performance. We address the general form of SPU and guarantee a tight estimation of the secret key rate based on the operator dominance method. We achieve secure key distribution over 303.37 km, which not only represents the farthest distance in experiments involving SPU but also considers the most SPU scenarios. Our experimental results represent a significant step toward promoting practical and secure quantum communication.
References in corpus (43)
- Quantum cryptography: Public key distribution and coin tossing
- Decoy State Quantum Key Distribution
- Measurement-device-independent quantum key distribution
- Advances in Quantum Cryptography
- Satellite-to-ground quantum key distribution
- Secure quantum key distribution with realistic devices
- Beating the PNS attack in practical quantum cryptography
- Measurement device independent quantum key distribution over 404 km optical fibre
- Secure quantum key distribution over 421 km of optical fiber
- Side-channel-free quantum key distribution
- Finite-key analysis for measurement-device-independent quantum key distribution
- Security in Quantum Cryptography
- High-rate quantum key distribution exceeding 110 Mb/s
- Quantum cryptography without detector vulnerabilities using optically-seeded lasers
- Alternative schemes for measurement-device-independent quantum key distribution
- Efficient decoy-state quantum key distribution with quantified security
- 10~Mb/s quantum key distribution
- Loss-tolerant quantum cryptography with imperfect sources
- Long-distance quantum key distribution secure against coherent attacks
- Fast Single Photon Detectors and real-time Key Distillation: Enabling High Secret Key Rate QKD Systems
- Chip-based measurement-device-independent quantum key distribution
- Experimental demonstration of high-rate measurement-device-independent quantum key distribution over asymmetric channels
- Decoy-state quantum key distribution with both source errors and statistical fluctuations
- Quantum key distribution with an efficient countermeasure against correlated intensity fluctuations in optical pulses
- Decoy state quantum key distribution with imperfect source
- Experimental quantum key distribution with source flaws
- Experimental Measurement-Device-Independent Quantum Key Distribution with Imperfect Sources
- Quantum key distribution with correlated sources
- Secure and efficient decoy-state quantum key distribution with inexact pulse intensities
- Finite-key security analysis of quantum key distribution with imperfect light sources
- Mismatched-basis statistics enable quantum key distribution with uncharacterized qubit sources
- Unbalanced-basis-misalignment tolerant measurement-device-independent quantum key distribution
- Quantum key distribution with setting-choice-independently correlated light sources
- Experimental Three-State Measurement-Device-Independent Quantum Key Distribution with Uncharacterized Sources
- Security of quantum key distribution with non-I.I.D. light sources
- Improved Measurement-Device-Independent Quantum Key Distribution with Uncharacterized Qubits
- Characterisation of state-preparation uncertainty in quantum key distribution
- Passive decoy-state quantum key distribution for the weak coherent photon source with intensity fluctuations
- Robust twin-field quantum key distribution through sending-or-not-sending
- Loss-tolerant quantum key distribution with a twist
- Quantum key distribution with unbounded pulse correlations
- Intensity correlations in decoy-state BB84 quantum key distribution systems
- Characterising higher-order phase correlations in gain-switched laser sources with application to quantum key distribution