研究目的
To improve the secure transmission distance of continuous variable quantum key distribution by proposing a protocol that uses photon subtraction at the receiver, combining reverse reconciliation, trusted noise concept, and non-Gaussian operations.
研究成果
The proposed CVQKD protocol with photon subtraction at the receiver enhances secure key transmission distance by synergistically combining non-Gaussian operations, reverse reconciliation, and the trusted noise concept. Numerical simulations confirm it outperforms conventional protocols in certain distance ranges, and it is feasible with practical photon detectors. The findings suggest the existence of Gaussian operations that improve security without beam splitters and provide guidance for system design in low-noise channels.
研究不足
The analysis relies on the Gaussian optimality theorem, which provides a lower bound for secure key rates and may not capture full non-Gaussian effects. Simulations use truncated summations, potentially introducing approximations. The protocol's performance improvement is bounded by channel noise levels, and practical implementations require advanced photon detection technologies.
1：Experimental Design and Method Selection:
The study uses a theoretical model and numerical simulations to analyze a CVQKD protocol with photon subtraction at the receiver under a collective attack. The Gaussian optimality theorem is applied to simplify calculations of secure key rates.
2：Sample Selection and Data Sources:
No physical samples or datasets are used; the work is based on mathematical models and simulations.
3：List of Experimental Equipment and Materials:
Not applicable as it is a theoretical study; however, it references potential devices like photon counters and detectors (e.g., Si or InGaAs single-photon avalanche diodes) for practical implementations.
4：Experimental Procedures and Operational Workflow:
The protocol involves Alice preparing a two-mode squeezed vacuum state, transmitting it through a quantum channel modeled as a beam splitter with transmittance T, Bob performing photon subtraction using a beam splitter and photon counter/detector, followed by homodyne detection, reverse reconciliation, and privacy amplification.
5：Data Analysis Methods:
Secure key rates are calculated using mutual information and Holevo information derived from covariance matrices of Gaussian states, with numerical simulations performed using truncated summations (infinity set to 30) to handle infinite dimensions.
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