The integration of sensing and communication can achieve ubiquitous sensing while enabling ubiquitous communication.Within the gradually improving global communication,the integrated sensing and communication system b...The integration of sensing and communication can achieve ubiquitous sensing while enabling ubiquitous communication.Within the gradually improving global communication,the integrated sensing and communication system based on optical fibers can accomplish various functionalities,such as urban structure imaging,seismic wave detection,and pipeline safety monitoring.With the development of quantum communication,quantum networks based on optical fiber are gradually being established.In this paper,we propose an integrated sensing and quantum network(ISAQN)scheme,which can achieve secure key distribution among multiple nodes and distributed sensing under the standard quantum limit.The continuous variables quantum key distribution protocol and the round-trip multiband structure are adopted to achieve the multinode secure key distribution.Meanwhile,the spectrum phase monitoring protocol is proposed to realize distributed sensing.It determines which node is vibrating by monitoring the frequency spectrum and restores the vibration waveform by monitoring the phase change.The scheme is experimentally demonstrated by simulating the vibration in a star structure network.Experimental results indicate that this multiuser quantum network can achieve a secret key rate of approximately 0.7 Mbits/s for each user under 10-km standard fiber transmission,and its network capacity is 8.In terms of distributed sensing,it can achieve a vibration response bandwidth ranging from 1 Hz to 2 kHz,a strain resolution of 0.50 nε/Hz,and a spatial resolution of 0.20 m under shot-noise-limited detection.The proposed ISAQN scheme enables simultaneous quantum communication and distributed sensing in a multipoint network,laying a foundation for future large-scale quantum networks and high-precision sensing networks.展开更多
Shaping the structure of light with flat optical devices has driven significant advancements in our fundamental understanding of light and light-matter interactions,and enabled a broad range of applications,from image...Shaping the structure of light with flat optical devices has driven significant advancements in our fundamental understanding of light and light-matter interactions,and enabled a broad range of applications,from image processing and microscopy to optical communication,quantum information processing,and the manipulation of microparticles.Yet,pushing the boundaries of structured light beyond the linear optical regime remains an open challenge.Nonlinear optical interactions,such as wave mixing in nonlinear flat optics,offer a powerful platform to unlock new degrees of freedom and functionalities for generating and detecting structured light.In this study,we experimentally demonstrate the non-trivial structuring of third-harmonic light enabled by the addition of total angular momentum projection in a nonlinear,isotropic flat optics element—a single thin film of amorphous silicon.We identify the total angular momentum projection and helicity as the most critical properties for analyzing the experimental results.The theoretical approach we propose,supported by numerical simulations,offers quantitative predictions for light structuring through nonlinear wave mixing under various pumping conditions,including vectorial and non-paraxial pump light.Notably,we reveal that the shape of third-harmonic light is highly sensitive to the polarization state of the pump.Our findings demonstrate that harnessing the addition of total angular momentum projection in nonlinear wave mixing can be a powerful strategy for generating and detecting precisely controlled structured light.展开更多
基金supported by Innovation Program for Quantum Science and Technology(Grant No.2021ZD0300703)the National Natural Science Foundation of China(Grant No.62101320)+1 种基金the Shanghai Municipal Science and Technology Major Project(Grant No.2019SHZDZX01)the Hebei Provincial Science and Technology Project(Grant No.22310701D).
文摘The integration of sensing and communication can achieve ubiquitous sensing while enabling ubiquitous communication.Within the gradually improving global communication,the integrated sensing and communication system based on optical fibers can accomplish various functionalities,such as urban structure imaging,seismic wave detection,and pipeline safety monitoring.With the development of quantum communication,quantum networks based on optical fiber are gradually being established.In this paper,we propose an integrated sensing and quantum network(ISAQN)scheme,which can achieve secure key distribution among multiple nodes and distributed sensing under the standard quantum limit.The continuous variables quantum key distribution protocol and the round-trip multiband structure are adopted to achieve the multinode secure key distribution.Meanwhile,the spectrum phase monitoring protocol is proposed to realize distributed sensing.It determines which node is vibrating by monitoring the frequency spectrum and restores the vibration waveform by monitoring the phase change.The scheme is experimentally demonstrated by simulating the vibration in a star structure network.Experimental results indicate that this multiuser quantum network can achieve a secret key rate of approximately 0.7 Mbits/s for each user under 10-km standard fiber transmission,and its network capacity is 8.In terms of distributed sensing,it can achieve a vibration response bandwidth ranging from 1 Hz to 2 kHz,a strain resolution of 0.50 nε/Hz,and a spatial resolution of 0.20 m under shot-noise-limited detection.The proposed ISAQN scheme enables simultaneous quantum communication and distributed sensing in a multipoint network,laying a foundation for future large-scale quantum networks and high-precision sensing networks.
基金supported by the European Union under the Italian National Recovery and Resilience Plan(NRRP)of NextGenerationEU,of partnership on“Telecommunications of the Future”(PE00000001-program“RESTART”)S2 SUPER-Programmable Networks,Cascade project PRISM-CUP:C79J24000190004+1 种基金Cascade project SMART-CUP:Smart Metasurfaces Advancing Radio Technology(SMART),PRIN 2020 project METEOR(2020EY2LJT)METAFAST project that received funding from the European Union Horizon 2020 Research and Innovation program under Grant Agreement No.899673.
文摘Shaping the structure of light with flat optical devices has driven significant advancements in our fundamental understanding of light and light-matter interactions,and enabled a broad range of applications,from image processing and microscopy to optical communication,quantum information processing,and the manipulation of microparticles.Yet,pushing the boundaries of structured light beyond the linear optical regime remains an open challenge.Nonlinear optical interactions,such as wave mixing in nonlinear flat optics,offer a powerful platform to unlock new degrees of freedom and functionalities for generating and detecting structured light.In this study,we experimentally demonstrate the non-trivial structuring of third-harmonic light enabled by the addition of total angular momentum projection in a nonlinear,isotropic flat optics element—a single thin film of amorphous silicon.We identify the total angular momentum projection and helicity as the most critical properties for analyzing the experimental results.The theoretical approach we propose,supported by numerical simulations,offers quantitative predictions for light structuring through nonlinear wave mixing under various pumping conditions,including vectorial and non-paraxial pump light.Notably,we reveal that the shape of third-harmonic light is highly sensitive to the polarization state of the pump.Our findings demonstrate that harnessing the addition of total angular momentum projection in nonlinear wave mixing can be a powerful strategy for generating and detecting precisely controlled structured light.
