Coherent one-way quantum conference key agreement based on twin field
Xiao-Yu Cao, Jie Gu, Yu-Shuo Lu, Hua-Lei Yin, Zeng-Bing Chen
Abstract
Abstract Quantum conference key agreement (CKA) enables key sharing among multiple trusted users with information-theoretic security. Currently, the key rates of most quantum CKA protocols suffer from the limit of the total efficiency among quantum channels. Inspired by the coherent one-way and twin-field quantum key distribution (QKD) protocols, we propose a quantum CKA protocol of three users. Exploiting coherent states with intensity 0 and μ to encode logic bits, our protocol can break the limit. Additionally, the requirements of phase randomization and multiple intensity modulation are removed in our protocol, making its experimental demonstration simple.
Topics & Concepts
PhysicsQuantum key distributionKey (lock)Protocol (science)QuantumQuantum mechanicsCoherent statesQuantum networkLimit (mathematics)Quantum information scienceQuantum error correctionField (mathematics)BB84Quantum channelQuantum informationModulation (music)Statistical physicsQuantum cryptographyQuantum sensorTopology (electrical circuits)Key generationQuantum computerQuantum gateQuantum capacityQuantum entanglementENCODEPhase (matter)Quantum algorithmEncoding (memory)Quantum opticsAmplitude damping channelTheoretical physicsQuantum limitQuantum stateQuantum Information and CryptographyQuantum Mechanics and ApplicationsQuantum Computing Algorithms and Architecture