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Device-independent quantum key distribution with realistic single-photon source implementations
Optics Express
|June 11, 2024
Summary
Device-independent quantum key distribution (DIQKD) enables secure communication without trusting devices. This study proposes a photonic DIQKD protocol achieving high secret-key rates over long distances.
Area of Science:
- Quantum Information Science
- Quantum Cryptography
- Photonics
Background:
- Device-independent quantum key distribution (DIQKD) enhances security by removing assumptions about device trustworthiness.
- Existing DIQKD protocols often require complex setups or have stringent parameter requirements.
Purpose of the Study:
- To investigate a fully photonic DIQKD protocol.
- To establish conditions for achieving non-zero secret-key rates.
- To reduce the physical parameter requirements for practical DIQKD.
Main Methods:
- Proposal of a DIQKD scheme utilizing single-photon sources and central heralding measurements.
- Derivation of key rate conditions based on photon efficiency, indistinguishability, and second-order autocorrelation.
- Application of new security bound results to relax physical parameter constraints.
Main Results:
- Identified critical parameters for attaining non-zero secret-key rates in photonic DIQKD.
- Demonstrated that reduced requirements on physical parameters are achievable.
- Projected secret-key rates of hundreds of bits per second over tens of kilometers.
Conclusions:
- The proposed photonic DIQKD scheme is feasible and offers practical advantages.
- The protocol can achieve significant secret-key rates at relevant distances.
- This work advances the development of secure, device-independent quantum communication.
