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Fully counterfactual quantum communication protocols within a twin-field framework.

Na Hai, Zi-Jian Liu, Bo-Wen Zhang

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    |February 20, 2026
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a counterfactual quantum protocol for secure identity authentication and key distribution. The novel protocol enables secure communication without particle transmission, achieving a secure distance of approximately 190 km.

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    Area of Science:

    • Quantum Information Science
    • Quantum Communication Security

    Background:

    • Counterfactual communication involves information exchange without physical particle transmission.
    • Existing protocols lack robustness and secure key distribution capabilities.

    Purpose of the Study:

    • To propose a tripartite counterfactual quantum protocol for identity authentication.
    • To enable secure random key sharing between Alice and Bob via Charlie.
    • To enhance communication security and robustness against environmental noise.

    Main Methods:

    • Modification of Aharonov-Vaidman protocols for counterfactual communication.
    • Utilizing the two-state vector formalism for theoretical underpinning.
    • Implementing a trusted certificate authority (Charlie) for key distribution.
    • Security analysis within a twin-field quantum key distribution framework.

    Main Results:

    • The protocol demonstrates high robustness against environmental noise.
    • It successfully passes the Fisher information test for security.
    • Identity authorization is transformed into quantum-assisted key distribution.
    • Simulations show a maximal secure distance of around 190 km for weak coherent states.

    Conclusions:

    • The proposed counterfactual quantum protocol offers a secure and robust method for identity authentication and key distribution.
    • The protocol's security is maintained within a twin-field framework.
    • It advances the field of quantum communication by enabling secure interactions without direct particle exchange over significant distances.