Ultrafast cryptography with indefinitely switchable optical nanoantennas  

作　　者：Pujuan Ma Lei Gao Pavel Ginzburg Roman E.Noskov 

机构地区：[1]School of Physical Science and Technology of Soochow University,Collaborative Innovation Center of Suzhou Nano Science and Technology,Soochow University,Suzhou 215006,China [2]Department of Electrical Engineering,Tel Aviv University,Ramat Aviv,Tel Aviv 69978,Israel [3]Light-Matter Interaction Centre,Tel Aviv University,Ramat Aviv,Tel Aviv 69978,Israel

出　　处：《Light(Science & Applications)》2018年第1期313-321,共9页光（科学与应用)（英文版）

基　　金：supported by PAZY Foundation,Kamin Project,the National Natural Science Foundation of China(Grant No.11374223);the National Science of Jiangsu Province(Grant No.BK20161210);the Qing Lan project,the“333”project(Grant No.BRA2015353);PAPD of Jiangsu Higher Education Institutions and China Scholarship Council(CSC).

摘　　要：Bistability is widely exploited to demonstrate all-optical signal processing and light-based computing.The standard paradigm of switching between two steady states corresponding to“0”and“1”bits is based on the rule that a transition occurs when the signal pulse intensity overcomes the bistability threshold,and otherwise,the system remains in the initial state.Here,we break with this concept by revealing the phenomenon of indefinite switching in which the eventual steady state of a resonant bistable system is transformed into a nontrivial function of signal pulse parameters for moderately intense signal pulses.The essential nonlinearity of the indefinite switching allows realization of well-protected cryptographic algorithms with a single bistable element in contrast to software-assisted cryptographic protocols that require thousands of logic gates.As a proof of concept,we demonstrate stream deciphering of the word“enigma”by means of an indefinitely switchable optical nanoantenna.An extremely high bitrate ranging from~0.1 to 1 terabits per second and a small size make such systems promising as basic elements for all-optical cryptographic architectures.

关 键 词：OPTICAL otherwise OVERCOME 

分 类 号：TN2[电子电信—物理电子学]