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Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
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Single-Qubit Loss-Tolerant Quantum Position Verification Protocol Secure against Entangled Attackers
Llorenç Escolà-Farràs1, Florian Speelman1
1QuSoft, CWI Amsterdam, Science Park 123, 1098 XG Amsterdam, The Netherlands and Multiscale Networked Systems (MNS), Informatics Institute, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands.
Physical Review Letters
|October 20, 2023
Summary
This study characterizes loss tolerance in quantum position verification protocols. We developed a novel fault-tolerant protocol secure against specific quantum and entanglement attacks, improving security and loss tolerance.
Area of Science:
- Quantum Information Science
- Quantum Cryptography
- Quantum Communication Security
Background:
- Quantum position verification (QVP) protocols are crucial for secure positioning.
- Existing protocols face limitations in loss tolerance and security against sophisticated attacks.
Purpose of the Study:
- To tightly characterize the relationship between loss tolerance and error rate in BB84-based QVP.
- To develop a novel fault-tolerant QVP protocol with enhanced security and loss tolerance.
Main Methods:
- Utilized semidefinite programming to analyze protocol security.
- Combined classical information with quantum states (BB84) for enhanced robustness.
- Extended analysis to multi-basis protocols.
Main Results:
- Established a precise characterization of loss tolerance versus error rate for BB84-based QVP.
- Demonstrated the first fault-tolerant QVP protocol secure against linear entanglement and arbitrary quantum information speed.
- Showcased improved loss tolerance with multi-basis extensions.
- Applied techniques to enhance one-sided device-independent quantum key distribution (QKD) analysis.
Conclusions:
- The developed QVP protocol offers significant improvements in fault tolerance and security.
- The methodology provides a framework for analyzing and enhancing other quantum information protocols, including QKD.
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