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On the Directivity of Radiating quantum Electromagnetic Systems

Electromagnetic Science 2024年第3期2卷 52-70页

作者： Said Mikki Zhejiang University-University of Illinois at Urbana-Champaign(ZJU-UIUC)Institute Zhejiang UniversityHaining 314400China Department of Electrical and Computer Engineering University of Illinois at Urbana-ChampaignUrbana 61801-3028ILUSA

We explore the spatial directivity of radiating quantum source systems,which are defined as any generic source capable of producing photon emission and directing it to specific regions in *** present a comprehensive definition of quantum directivity,inspired by both classical antenna theory and photon detection *** an in-depth conceptual and mathematical analysis,we identify and address several critical challenges associated with characterizing the directive properties of a general quantum source *** approach essentially presents a computational model that relies solely on the density operator of the radiation field as input.

关键词： quantum source systems Directivity quantum antennas quantum technologies

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Widely tunable single-photon source with high spectral-purity from telecom wavelength to mid-infrared wavelength based on MgO:PPLN

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Chinese Physics B 2021年第10期30卷 108-112页

作者： Chang-Wei Sun Yu Sun Jia-Chen Duan Guang-Tai Xue Yi-Chen Liu Liang-Liang Lu Qun-Yong Zhang Yan-Xiao Gong Ping Xu Shi-Ning Zhu National Laboratory of Solid State Microstructures and School of Physics Nanjing UniversityNanjing 210093China Key Laboratory of Optoelectronic Technology of Jiangsu Province School of Physical Science and TechnologyNanjing Normal UniversityNanjing 210023China Faculty of Mathematics and Physics Huaiyin Institute of TechnologyHuaian 223003China

By utilizing the extended phase-matching(EPM)method,we investigate the generation of single photons with high spectral-purity in a magnesium-doped periodically-poled lithium niobate(MgO:PPLN)crystal via the spontaneous parametric down-conversion(SPDC)*** adjusting the temperature and pump wavelength,the wavelength of the single photons can be tuned from telecom to mid-infrared(MIR)wavelengths,for which the spectral-purity can be above 0.95 with high transmission *** experiments,we engineer a MgO:PPLN with poling period of 20.35µm which emits the EPM photon pair centered at 1496.6 nm and 1644.0 nm and carry out the joint spectral intensity(JSI)and Glauber’s second-order self-correlation measurements to characterize the spectral *** results are in good agreement with the numerical *** work may provide a valuable approach for the generation of spectrally pure single photons at a wide range of wavelengths which is competent for various photonic quantum technologies.

关键词： single photons quantum technologies periodically-poled lithium niobate

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