Quantum networks using photonic channels require control of the interactions between the photons, carrying the information, and the elements comprising the nodes. In this work we theoretically analyse the spectral properties of an optical photon emitted by a solid-state quantum memory, which acts as a converter of a photon absorbed in another frequency range. We determine explicitly the expression connecting the stored and retrieved excitation taking into account possible mode and phase mismatch of the experimental setup. The expression we obtain describes the output field as a function of the input field for a transducer working over a wide range of frequencies, from optical-to-optical to microwave-to-optical. We apply this result to analyse the photon spectrum and the retrieval probability as a function of the optical depth for microwave-to-optical transduction. In the absence of losses, the efficiency of the solid-state quantum transducer is intrinsically determined by the capability of designing the retrieval process as the time-reversal of the storage dynamics.
An on-chip programmable mechano-quantum transducer
Northwestern Polytechnical University（西北工业大学）；University of Science and Technology of China（中国科学技术大学）；Ningbo Institute of Northwestern Polytechnical University（西北工业大学宁波研究院）；Hefei National Laboratory, University of Science and Technology of China（中国科学技术大学合肥国家实验室）
Institute for Quantum Science and Technology, University of Calgary（卡尔加里大学量子科学与技术研究所）；Department of Physics and Astronomy, University of Calgary（卡尔加里大学物理与天文学系）
Key Laboratory of Atomic and Subatomic Structure and Quantum Control (Ministry of Education), Guangdong Basic Research Center of Excellence for Structure and Fundamental Interactions of Matter, and School of Physics, South China Normal University（华南师范大学物理学院原子与亚原子结构及量子控制教育部重点实验室、广东省物质结构与基本相互作用卓越基础研究中心）；Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials, Guangdong-Hong Kong Joint Laboratory of Quantum Matter, and Frontier Research Institute for Physics, South China Normal University（华南师范大学前沿物理研究院量子工程与量子材料广东省重点实验室、粤港澳量子物质联合实验室）；Quantum Science Center of Guangdong-Hong Kong-Macao Greater Bay Area（粤港澳大湾区量子科学中心）；GPETR Center for Quantum Precision Measurement, South China Normal University（华南师范大学GPETR量子精密测量中心）；Hefei National Laboratory（合肥国家实验室）
A solid-state quantum memory based on a continuous optoacoustic system
Max Planck Institute for the Science of Light（马克斯·普朗克光科学研究所）；Institute of Photonics, Leibniz University Hannover（汉诺威莱布尼茨大学光子学研究所）；TU Darmstadt, Institute for Applied Physics（达姆施塔特工业大学应用物理研究所）；Department of Physics, Friedrich-Alexander-Universität Erlangen-Nürnberg（埃尔朗根-纽伦堡弗里德里希-阿历山大大学物理系）
Realization of Backward Retrieval in a Stark-modulated Spin-wave Quantum Memory
Southern University of Science and Technology（南方科技大学）；International Quantum Academy, and Shenzhen Branch, Hefei National Laboratory（国际量子学院合肥国家实验室深圳分院）；CAS Key Laboratory of Quantum Information, University of Science and Technology of China（中国科学院量子信息重点实验室中国科学技术大学）；Anhui Province Key Laboratory of Quantum Network, University of Science and Technology of China（安徽省量子网络重点实验室中国科学技术大学）；CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China（中国科学院量子信息与量子物理前沿卓越创新中心中国科学技术大学）；Hefei National Laboratory, University of Science and Technology of China（合肥国家实验室中国科学技术大学）
Surface-acoustic-wave-controlled optomechanically induced transparency in a hybrid piezo-optomechanical planar distributed Bragg-reflector-cavity system
A hybrid quantum network linking telecom-wavelength atomic and solid-state nodes
Pritzker School of Molecular Engineering, University of Chicago（芝加哥大学普里茨克分子工程学院）；Institute for Quantum Optics and Quantum Information, Austrian Academy of Sciences（奥地利科学院量子光学与量子信息研究所）；Institute for Experimental Physics, University of Innsbruck（因斯布鲁克大学实验物理研究所）；Materials Science Division, Argonne National Laboratory（阿贡国家实验室材料科学部）；Q-NEXT, Argonne National Laboratory（阿贡国家实验室Q-NEXT）
Single organic molecules for photonic quantum technologies
CNR-INO and LENS（意大利国家研究委员会光学研究所和欧洲纳米科学实验室）；Centre for Cold Matter, Blackett Laboratory, Imperial College London（帝国理工学院布莱克特冷物质中心）；ICFO − Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology（巴塞罗那科学技术研究院光子科学研究所）；Max Planck Institute for the Science of Light（马克斯·普朗克光科学研究所）；Friedrich-Alexander University of Erlangen-Nürnberg（埃尔朗根-纽伦堡弗里德里希·阿历山大大学）；Institute of Physics, Polish Academy of Sciences（波兰科学院物理研究所）；CEMES-CNRS（法国国家科学研究中心电子与分子结构中心）
Sub-second spin and lifetime-limited optical coherences in $^{171}$Yb$^{3+}$:CaWO$_4$
Chimie ParisTech, PSL University（巴黎高等化学学校，PSL大学）；California Institute of Technology（加州理工学院）；CNRS, Aix Marseille Univ, Université de Toulon（法国国家科学研究中心，艾克斯-马赛大学，土伦大学）
