Continuous-variable quantum passive optical network  

作　　者：Adnan A.E.Hajomer Ivan Derkach Radim Filip Ulrik L.Andersen Vladyslav C.Usenko Tobias Gehring 

机构地区：[1]Center for Macroscopic Quantum States(bigQ),Department of Physics,Technical University of Denmark,2800 Kongens Lyngby,Denmark [2]Department of Optics,Faculty of Science,Palacky University,17.listopadu 12,77146 Olomouc,Czech Republic

出　　处：《Light(Science & Applications)》2024年第12期3099-3108,共10页光(科学与应用)(英文版)

基　　金：funded within the QuantERA II Program(project CVSTAR)and has received funding from the European Union’s Horizon 2020 research and innovation program under Grant Agreement No.731473 and 101017733;from the European Union’s Digital Europe program under Grant Agreement No.101091659(QCI.DK);from the European Union’s Horizon Europe research and innovation program under the project“Quantum Security Networks Partnership”(QSNP,Grant Agreement No.101114043);support from Innovation Fund Denmark(CryptQ,0175-00018A);the Danish National Research Foundation,Center for Macroscopic Quantum States(bigQ,DNRF142);funding from the Carlsberg Foundation,project CF21-0466;support from the project 22-28254O of the Czech Science Foundation.R.F.acknowledges project 21-13265X of the Czech Science Foundation;project CZ.02.01.01/00/22_008/0004649(QUEENTEC)of the Czech MEYS.V.C.U.acknowledges the project 21-44815L of the Czech Science Foundation。

摘　　要：To establish a scalable and secure quantum network,a critical milestone is advancing from basic point-to-point quantum key distribution(QKD)systems to the development of inherently multi-user protocols designed to maximize network capacity.Here,we propose a quantum passive optical network(QPON)protocol based on continuousvariable(CV)systems,particularly the quadrature of the coherent state,which enables deterministic,simultaneous,and high-rate secret key generation among all network users.We implement two protocols with different trust levels assigned to the network users and experimentally demonstrate key generation in a quantum access network with 8 users,each with an 11 km span of access link.Depending on the trust assumptions about the users,we reach 1.5 and 2.1 Mbits/s of total network key generation(or 0.4 and 1.0 Mbits/s with finite-size channels estimation).Demonstrating the potential to expand the network’s capacity to accommodate tens of users at a high rate,our CV-QPON protocols open up new possibilities in establishing low-cost,high-rate,and scalable secure quantum access networks serving as a stepping stone towards a quantum internet.

关 键 词：NETWORK QUANTUM PASSIVE 

分 类 号：TP3[自动化与计算机技术—计算机科学与技术]