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Device-independent quantum key distribution with realistic single-photon source implementations.

Eva M González-Ruiz, Javier Rivera-Dean, Marina F B Cenni

|June 11, 2024

Summary

This summary is machine-generated.

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.

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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.