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Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
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Experimental Efficient Source-Independent Quantum Secret Sharing against Coherent Attacks
Yi-Ran Xiao1,2, Hua-Lei Yin1,2,3, Wen-Ji Hua1,2
1Nanjing University, National Laboratory of Solid State Microstructures and School of Physics, Collaborative Innovation Center of Advanced Microstructures, Nanjing 210093, China.
Physical Review Letters
|October 25, 2025
Summary
This study demonstrates a resource-efficient quantum secret sharing protocol for secure multi-user quantum networks. The experiment shows high secure key rates, independent of the number of users, paving the way for practical applications.
Area of Science:
- Quantum Information Science
- Quantum Cryptography
- Quantum Communication Networks
Background:
- Source-independent quantum secret sharing (SI QSS) is crucial for secure multi-user quantum networks.
- Implementing SI QSS is challenging due to the complexity of generating and distributing multipartite entangled states.
Purpose of the Study:
- To experimentally demonstrate a resource-efficient SI QSS protocol.
- To validate the protocol's performance in a multi-user quantum network setting.
Main Methods:
- Utilized high-fidelity polarization-entangled photon pairs.
- Implemented a star topology for a three-user network.
- Employed a post-measurement method for resource efficiency.
Main Results:
- Achieved secure key rates of 21.18, 4.69, and 1.71 kbps for a three-user network with varying channel losses.
- Obtained secure key rates of 6.97, 6.46, and 5.88 kbps for three-, four-, and five-user scenarios with equal channel loss.
- Demonstrated that the secure key rate is independent of the number of users.
Conclusions:
- The experimental demonstration validates the feasibility of the resource-efficient SI QSS protocol.
- The protocol's performance, particularly its key rate independence from user count, supports its potential for large-scale deployment in multi-user quantum networks.
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