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Noise and Security Analysis of Trusted Phase Noise Continuous Variable Quantum Key Distribution using a Local Local Oscillator

Accepted version
Peer-reviewed

Type

Conference Object

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Authors

Abstract

We study the validity of partially trusting the phase noise associated with estimation uncertainty in a continuous variable quantum key distribution system with a local local oscillator (LLO-CVQKD) and investigate optimal system parameters. We find that the trusted phase noise model enhances the key rate and transmission distance performance but opens a security loophole by manipulating the reference pulse amplitude. Therefore, we propose a 'reference pulse attack' on the trusted phase noise LLO-CVQKD system where Eve achieves 100% information hacking without being detected at 23.8km and 32.0km while using lossless and 0.14dB/km loss channels, respectively. Nevertheless, by re-analyzing the attack, countermeasures are also proposed to keep the performance advantages of the trusted phase noise model. As a result, the trusted phase noise LLO-CVQKD can still provide a superior secure key rate (e.g., 9 times higher key rate at 20km) and an increased transmission distance by 45%, compared to that of the untrusted phase noise system.

Description

Keywords

quantum key distribution, information hacking, trusted phase noise, security analysis, noise analysis

Journal Title

2019 IEEE 20th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC)

Conference Name

2019 IEEE 20th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC)

Journal ISSN

2325-3789

Volume Title

Publisher

IEEE

Rights

All rights reserved
Sponsorship
EPSRC (via University of York) (EP/M013472/1 R16690)
EPSRC (via University of York) (EP/M013472/1)