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Three party quantum key distribution using bilocality
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DOI：10.1007/s11082-025-08612-3.png)
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Abstract
En 中文
Quantum Key Distribution (QKD) uses the principles of quantum mechanics to establish secure cryptographic keys among two or more parties. It includes encoding of the quantum state with the help of a quantum detector and quantum operations. Many QKD protocols have been developed to allow safe key establishment between two parties BB84, E91, etc. However, multiparty QKD is still remains a challenge due to the inherent principle of quantum mechanics like entanglement and observation. This paper puts a step ahead to establish a three-party QKD protocol that allows secure key establishment within a network. The proposed model is a closed three-party network architecture that uses the theory of bilocality. The model comprises three independent sources that share entangled particles with adjacent neighbors. The proposed QKD protocol provides a secret key distribution when measured with suitable observables and has potential applications like military operations that involve secure communication. The quantum bit error rate (QBER) and key generation rate guarantee efficient key establishment and security against eavesdropping in the network.
Keywords:
Three-party QKD
Quantum entanglement
QBER
Key rate
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