High-speed integrated QKD system  

作　　者：REBECKA SAX ALBERTO BOARON GIANLUCA BOSO SIMONE ATZENI ANDREA CRESPI FADRI GRÜNENFELDER DAVIDE RUSCA AWS AL-SAADI DANILO BRONZI SEBASTIAN KUPIJAI HANJO RHEE ROBERTO OSELLAME HUGO ZBINDEN 

机构地区：[1]Group of Applied Physics,University of Geneva,1205 Genève,Switzerland [2]ID Quantique SA,1227 Genève,Switzerland [3]Institute for Photonics and Nanotechnologies and NO-IFN,CNR-IFN,20133 Milano,Italy [4]Dipartimento di Fisica,Politecnico di Milano,20133 Milano,Italy [5]Sicoya GmbH,12489 Berlin,Germany

出　　处：《Photonics Research》2023年第6期1007-1014,共8页光子学研究（英文版）

基　　金：Eurostars Projects(E!11493);European Quantum Flagship project openQKD(857156);Italian Ministry for University and Research(PRIN2017-SRNBRK,PNRR-NQSTI);European Research Council(742745)。

摘　　要：Quantum key distribution(QKD)is nowadays a well-established method for generating secret keys at a distance in an information-theoretically secure way,as the secrecy of QKD relies on the laws of quantum physics and not on computational complexity.In order to industrialize QKD,low-cost,mass-manufactured,and practical QKD setups are required.Hence,photonic and electronic integration of the sender's and receiver's respective components is currently in the spotlight.Here we present a high-speed(2.5 GHz)integrated QKD setup featuring a transmitter chip in silicon photonics allowing for high-speed modulation and accurate state preparation,as well as a polarization-independent low-loss receiver chip in aluminum borosilicate glass fabricated by the femtosecond laser micromachining technique.Our system achieves raw bit error rates,quantum bit error rates,and secret key rates equivalent to a much more complex state-of-the-art setup based on discrete components[A.Boaron et al.,Phys.Rev.Lett.121,190502(2018)].

关 键 词：TECHNIQUE QKD POLARIZATION 

分 类 号：O413[理学—理论物理] TN918.4[理学—物理]