Integrated photonic devices are essential for on-chip optical communication,optical-electronic systems,and quantum information sciences.To develop a high-fidelity interface between photonics in various frequency domai...Integrated photonic devices are essential for on-chip optical communication,optical-electronic systems,and quantum information sciences.To develop a high-fidelity interface between photonics in various frequency domains without disturbing their quantum properties,nonlinear frequency conversion,typically steered with the quadratic(χ2)process,should be considered.Furthermore,another degree of freedom in steering the spatial modes during theχ2 process,with unprecedent mode intensity is proposed here by modulating the lithium niobate(LN)waveguide-based inter-mode quasi-phasematching conditions with both temperature and wavelength parameters.Under high incident light intensities(25 and 27.8 dBm for the pump and the signal lights,respectively),mode conversion at the sum-frequency wavelength with sufficient high output power(−7–8 dBm)among the TM01,TM10,and TM00 modes is realized automatically with characterized broad temperature(ΔT≥8°C)and wavelength windows(Δλ≥1 nm),avoiding the previous efforts in carefully preparing the signal or pump modes.The results prove that high-intensity spatial modes can be prepared at arbitrary transparent wavelength of theχ2 media toward on-chip integration,which facilitates the development of chip-based communication and quantum information systems because spatial correlations can be applied to generate hyperentangled states and provide additional robustness in quantum error correction with the extended Hilbert space.展开更多
在智慧技术发展背景下,O2O模式(online to offline)逐渐兴起。外卖服务在餐饮领域迅速发展,其空间分异现象及其影响成为研究热点。文章将餐饮店划分为三类,分别为堂食导向型、外卖导向型及同时提供堂食与外卖服务的综合型。研究对天津...在智慧技术发展背景下,O2O模式(online to offline)逐渐兴起。外卖服务在餐饮领域迅速发展,其空间分异现象及其影响成为研究热点。文章将餐饮店划分为三类,分别为堂食导向型、外卖导向型及同时提供堂食与外卖服务的综合型。研究对天津市中心城区这三种店铺的空间分异现状展开分析。研究发现,堂食导向型餐饮店的空间异质性较为显著,受诸如区域功能、交通等城市因素的影响较大;外卖导向型餐饮店在微观尺度上的空间自相关性较强,受自身配送效率、市场需求等因素的影响较大;综合型餐饮店的各项指标介于前两者之间,体现出两种模式的混合影响。此外,本研究还选取了空间分异度高值区域进行问卷发放,调研空间分异对社会生活产生的影响,并针对其中涉及的区域规划治理问题提出了规划建议。展开更多
基金financial supports from National Key Research and Development Program of China(2021YFB3602500)Self-deployment Project of Fujian Science&Technology Innovation Laboratory for Optoelectronic Information of China(2021ZZ101)National Natural Science Foundation of China(Grant Nos.62275247 and 61905246).
文摘Integrated photonic devices are essential for on-chip optical communication,optical-electronic systems,and quantum information sciences.To develop a high-fidelity interface between photonics in various frequency domains without disturbing their quantum properties,nonlinear frequency conversion,typically steered with the quadratic(χ2)process,should be considered.Furthermore,another degree of freedom in steering the spatial modes during theχ2 process,with unprecedent mode intensity is proposed here by modulating the lithium niobate(LN)waveguide-based inter-mode quasi-phasematching conditions with both temperature and wavelength parameters.Under high incident light intensities(25 and 27.8 dBm for the pump and the signal lights,respectively),mode conversion at the sum-frequency wavelength with sufficient high output power(−7–8 dBm)among the TM01,TM10,and TM00 modes is realized automatically with characterized broad temperature(ΔT≥8°C)and wavelength windows(Δλ≥1 nm),avoiding the previous efforts in carefully preparing the signal or pump modes.The results prove that high-intensity spatial modes can be prepared at arbitrary transparent wavelength of theχ2 media toward on-chip integration,which facilitates the development of chip-based communication and quantum information systems because spatial correlations can be applied to generate hyperentangled states and provide additional robustness in quantum error correction with the extended Hilbert space.
文摘在智慧技术发展背景下,O2O模式(online to offline)逐渐兴起。外卖服务在餐饮领域迅速发展,其空间分异现象及其影响成为研究热点。文章将餐饮店划分为三类,分别为堂食导向型、外卖导向型及同时提供堂食与外卖服务的综合型。研究对天津市中心城区这三种店铺的空间分异现状展开分析。研究发现,堂食导向型餐饮店的空间异质性较为显著,受诸如区域功能、交通等城市因素的影响较大;外卖导向型餐饮店在微观尺度上的空间自相关性较强,受自身配送效率、市场需求等因素的影响较大;综合型餐饮店的各项指标介于前两者之间,体现出两种模式的混合影响。此外,本研究还选取了空间分异度高值区域进行问卷发放,调研空间分异对社会生活产生的影响,并针对其中涉及的区域规划治理问题提出了规划建议。
