Detector-device-independent QKD: security analysis and fast implementation

Abstract

One of the most pressing issues in quantum key distribution (QKD) is the problem of detector side- channel attacks. To overcome this problem, researchers proposed an elegant "time-reversal" QKD protocol called measurement-device-independent QKD (MDI-QKD), which is based on time-reversed entanglement swapping. However, MDI-QKD is more challenging to implement than standard point- to-point QKD. Recently, an intermediary QKD protocol called detector-device-independent QKD (DDI-QKD) has been proposed to overcome the drawbacks of MDI-QKD, with the hope that it would eventually lead to a more efficient detector side-channel-free QKD system. Here, we analyze the security of DDI-QKD and elucidate its security assumptions. We find that DDI-QKD is not equivalent to MDI-QKD, but its security can be demonstrated with reasonable assumptions. On the more practical side, we consider the feasibility of DDI-QKD and present a fast experimental demonstration (clocked at 625 MHz), capable of secret key exchange up to more than 90 km.

9 pages, 4 figures

References in corpus (14)

• Secure Quantum Key Distribution
• Hacking commercial quantum cryptography systems by tailored bright illumination
• Provably Secure and Practical Quantum Key Distribution over 307 km of Optical Fibre
• Quantum cryptography without detector vulnerabilities using optically-seeded lasers
• Measurement-device-independent quantum key distribution over untrustful metropolitan network
• After-gate attack on a quantum cryptosystem
• Quantum key distribution with an unknown and untrusted source
• Security proof of a three-state quantum key distribution protocol without rotational symmetry
• Measurement-device-independent quantum key distribution: from idea towards application
• Random Variation of Detector Efficiency: A Countermeasure against Detector Blinding Attacks for Quantum Key Distribution
• Detector-Device-Independent Quantum Key Distribution
• Quantum key distribution with untrusted detectors
• Trustworthiness of detectors in quantum key distribution with untrusted detectors
• Safeguarding Quantum Key Distribution through Detection Randomization

Cited by in corpus (6)

• Deploying an inter-European quantum network
• Simple and high-speed polarization-based QKD
• The limits of multiplexing quantum and classical channels: Case study of a 2.5 GHz discrete variable quantum key distribution system
• Quantum Key Distribution over 100 km underwater optical fiber assisted by a Fast-Gated Single-Photon Detector
• Efficient High-dimensional Quantum Key Distribution with Hybrid Encoding
• Violation of space-time Bell-CHSH inequality beyond Tsirelson bound via post selection and quantum cryptography