研究目的
To demonstrate measurement-device-independent entanglement witness (MDIEW) for multipartite entangled states, detect the genuine entanglement and the entanglement structure of a tripartite entangled state, and apply the verified entanglement in quantum randomness generation and open-destination quantum key distribution.
研究成果
The research successfully demonstrates MDIEW for multipartite entangled states, enabling the detection of genuine entanglement and entanglement structure in a tripartite state. It also showcases practical applications in quantum randomness generation and open-destination quantum key distribution, marking a significant advancement towards secure quantum networks.
研究不足
The experiment's technical constraints include the imperfections in the Bell state measurement apparatus and the noise from higher order spontaneous parametric down-conversion processes, which affect the fidelity of the measurements and the quantum bit error rate in quantum key distribution.
1：Experimental Design and Method Selection:
The experiment involves the manipulation of eight photons generated from four independent nonlinear crystals to prepare and witness tripartite entangled states.
2：Sample Selection and Data Sources:
Photons are used to prepare the to-be-witnessed states and ancillary states, with specific roles assigned to different photon pairs.
3：List of Experimental Equipment and Materials:
Includes β-barium borate (BBO) crystals for photon generation, polarizing beam splitters (PBS) for Bell state measurements, and half wave plates (HWPs) and quarter wave plates (QWPs) for state preparation.
4：Experimental Procedures and Operational Workflow:
Involves preparing the to-be-witnessed state, performing Bell state measurements on the joint state of the to-be-witnessed state and ancillary inputs, and analyzing the conditional probabilities of measurement outcomes.
5：Data Analysis Methods:
The score of the MDIEW is calculated based on conditional probabilities to distinguish entangled states from separable states.
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