研究目的
Investigating the improvement of secret key generation rates in measurement-device-independent quantum key distribution (mdi-QKD) through high-dimensional encoding (qudits).
研究成果
High-dimensional mdi-QKD improves the key generation rate compared to standard mdi-QKD, especially in the detector saturation regime. The protocol is unconditionally secure and can be implemented with existing technology.
研究不足
The protocol's performance is limited by detector dead time and the challenge of discriminating Bell states in high dimensions with linear optics.
1：Experimental Design and Method Selection:
The protocol involves Alice and Bob generating qudits encoded in different paths or time slots of photons, which then interfere at Charlie's beam splitters. The measurement projects the qubits into a two-dimensional subspace for QKD.
2：Sample Selection and Data Sources:
The study considers single-photon sources and weak coherent pulses with decoy states.
3：List of Experimental Equipment and Materials:
Photon sources, beam splitters, single-photon detectors.
4：Experimental Procedures and Operational Workflow:
Alice and Bob choose bases, generate qudits, send them to Charlie, who performs measurements and announces outcomes. The protocol is repeated for sufficient statistics.
5：Data Analysis Methods:
The secret key rate is derived considering phase errors, imperfect sources, and dark counts.
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