The development of quantum networks is paramount towards practical and secure communications.Quantum digital signatures(QDS)offer an information-theoretically secure solution for ensuring data integrity,authenticity,a...The development of quantum networks is paramount towards practical and secure communications.Quantum digital signatures(QDS)offer an information-theoretically secure solution for ensuring data integrity,authenticity,and nonrepudiation,rapidly growing from proof-of-concept to robust demonstrations.However,previous QDS systems relied on expensive and bulky optical equipment,limiting large-scale deployment and reconfigurable networking construction.Here,we introduce and verify a chip-based QDS network,placing the complicated and expensive measurement devices in the central relay while each user needs only a low-cost transmitter.We demonstrate the network with a three-node setup using an integrated encoder chip and decoder chip.By developing a 1-decoy-state one-time universal hashing-QDS protocol,we achieve a maximum signature rate of 0.0414 times per second for a 1 Mbit messages over fiber distances up to 200 km,surpassing all current state-of-the-art QDS experiments.This study validates the feasibility of chip-based QDS,paving the way for large-scale deployment and integration with existing fiber infrastructure.展开更多
基金supported by the National Natural Science Foundation of China(Nos.12274223,62171144,62031024,and 62171485)the Guangxi Science Foundation(No.2021GXNSFAA220011)+1 种基金the Open Fund of IPOC(BUPT)(No.IPOC2021A02)the Innovation Project of Guangxi Graduate Education(No.YCBZ2024002).
文摘The development of quantum networks is paramount towards practical and secure communications.Quantum digital signatures(QDS)offer an information-theoretically secure solution for ensuring data integrity,authenticity,and nonrepudiation,rapidly growing from proof-of-concept to robust demonstrations.However,previous QDS systems relied on expensive and bulky optical equipment,limiting large-scale deployment and reconfigurable networking construction.Here,we introduce and verify a chip-based QDS network,placing the complicated and expensive measurement devices in the central relay while each user needs only a low-cost transmitter.We demonstrate the network with a three-node setup using an integrated encoder chip and decoder chip.By developing a 1-decoy-state one-time universal hashing-QDS protocol,we achieve a maximum signature rate of 0.0414 times per second for a 1 Mbit messages over fiber distances up to 200 km,surpassing all current state-of-the-art QDS experiments.This study validates the feasibility of chip-based QDS,paving the way for large-scale deployment and integration with existing fiber infrastructure.
