报告题目：面向量子信息处理的非线性光子器件

报告人：陈险峰教授，上海交通大学物理与天文学院

报告时间：2020年10月24日 下午5点20分

报告地点：物理科技楼105室

报告邀请人：苏州大学物理科学与技术学院   蔡阳健  教授

报告摘要：Single-photon frequency conversion for quantum interface plays an important role in quantum communications and networks, which is crucial for the realization of quantum memory,faithful entanglement swapping and quantum teleportation. In this talk, I will present our recent experiments about single-photon frequency conversion based on quadratic nonlinear processes. Firstly, we demonstrated spectrum compression of broadband single photons at the telecom wavelength to the near-visible window. A positively chirped single-photon-level laser pulse and a negatively chirped classical one are converted to a narrowband single-photon pulse, with a spectrum compression factor of 58, through sum-frequency generation (SFG), marking a critical step towards coherent photonic interface. Secondly, we demonstrated the nonlinear interaction between two chirped broadband single-photon-level coherent states. A high SFG efficiency of 1.06 × 10⁻⁷ is realized, which may be utilized to achieve heralding entanglement at a distance. Finally, we theoretically introduced and experimentally demonstrated single-photon frequency conversion in the telecom band, enabling switching of single photons between dense wavelength-division multiplexing channels. Using cascaded quasi-phase matched sum/difference frequency generation, the signal photon of a photon pair from spontaneous down-conversion is precisely shifted to identically match its counterpart, i.e. idler photon, in frequency to manifest a clear non-classical dip in the Hong-Ou-Mandel interference. Moreover, quantum entanglement between the photon pair is maintained after the frequency conversion. Our researches have realized three significant quantum interfaces via single-photon frequency conversion, which hold great promise for the development of quantum communications and networks.

报告人简介：陈险峰，上海交通大学特聘教授，国家杰出青年基金获得者，中组部“万人计划”领军人才，科技部中青年科技创新领军人才，上海市优秀学术带头人等。享受政府特殊津贴。担任中国光学学会基础光学委员会副主任。在过去二十几年中开展了非线性光学、纳米光子学、量子光学、光电子器件等方向的研究。在Nature、Nature Photonics, Physical Review Letters，Optics Letters等本领域国际重要刊物上发表论文305篇，引用3500余次（Web of Science）。2010年由于在准相位匹配非线性光学和光与纳米结构材料相互作用方面的贡献获得亚太物理协会联合会杨振宁奖（AAPPS，C. N. Yang Award）。现任上海交通大学物理与天文学院光科学与技术研究所所长。

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