Andreas Angerer, Kirill Streltsov, Thomas Astner, Stefan Putz, Hitoshi Sumiya, Shinobu Onoda, William J. Munro, Kae Nemoto, Jörg Schmiedmayer, Johannes Majer
Superradiance is the archetypical collective phenomenon where radiation is amplified by the coherence of emitters. It plays a prominent role in optics, where it enables the design of lasers with substantially reduced linewidths, quantum mechanics, and is even used to explain cosmological observations like Hawking radiation from black holes. Hybridization of distinct quantum systems allows to engineer new quantum metamaterials pooling the advantages of the individual systems. Superconducting circuits coupled to spin ensembles are promising future building blocks of integrated quantum devices and superradiance will play a prominent role. As such it is important to study its fundamental properties in hybrid devices. Experiments in the strong coupling regime have shown oscillatory behaviour in these systems but a clear signature of Dicke superradiance has been missing so far. Here we explore superradiance in a hybrid system composed of a superconducting resonator in the fast cavity limit inductively coupled to an inhomogeneously broadened ensemble of nitrogen-vacancy (NV) centres. We observe a superradiant pulse being emitted a trillion of times faster than the decay for an individual NV centre. This is further confirmed by the non-linear scaling of the emitted radiation intensity with respect to the ensemble size. Our work provides the foundation for future quantum technologies including solid state superradiant masers.
Hybrid sub- and superradiant states in emitter arrays with quantized motion
Institut für Theoretische Physik and Center for Integrated Quantum Science and Technology, Universität Tübingen（蒂宾根大学理论物理研究所与综合量子科学与技术中心）；School of Physics and Astronomy and Centre for the Mathematics and Theoretical Physics of Quantum Non-Equilibrium Systems, The University of Nottingham（诺丁汉大学物理与天文学学院及量子非平衡系统数学与理论物理中心）
$\bf A^2$-robust superradiant phase transition in hybrid qubit-cavity optomechanics
Zhejiang Province Key Laboratory of Quantum Technology and Device, School of Physics and State Key Laboratory of Modern Optical Instrumentation, Zhejiang University（浙江大学量子技术与器件浙江省重点实验室、物理学院与现代光学仪器国家重点实验室）；Department of Physics, Wenzhou University（温州大学物理系）；International Quantum Academy, Shenzhen（深圳国际量子学院）
Stability of the Quantum Coherent Superradiant States in Relation to Exciton-Phonon Interactions and the Fundamental Soliton in Hybrid Perovskites
Ioffe Physical-Technical Institute, Russian Academy of Sciences（俄罗斯科学院列别杰夫物理技术研究所）；Tel Aviv University（特拉维夫大学）；Instituto de Alta Investigacion, Universidad de Tarapaca（塔拉帕卡大学高级研究院）；Institute for Advanced Study in Mathematics, Harbin Institute of Technology（哈尔滨工业大学数学高等研究院）；Suzhou Research Institute, Harbin Institute of Technology（哈尔滨工业大学苏州研究院）；Faculty of Sciences, Physics Department, Holon Institute of Technology（霍隆理工学院理学院物理系）
Nonreciprocal superradiant quantum phase transition induced by the magnon Kerr effect
School of Physics, Hangzhou Normal University（杭州师范大学物理学院）；Department of Physics, Wenzhou University（温州大学物理系）；International Quantum Academy, Shenzhen（深圳量子研究院）
Parametrically Driven Superradiance of an Interacting Tavis-Cummings Model
University of Science and Technology of China（中国科学技术大学）；Laboratory of Quantum Information, University of Science and Technology of China（中国科学技术大学量子信息实验室）；Anhui Province Key Laboratory of Quantum Network, University of Science and Technology of China（中国科学技术大学安徽省量子网络重点实验室）；CAS Center For Excellence in Quantum Information and Quantum Physics, Hefei 230026, China（中国科学院量子信息与量子物理卓越创新中心）；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）；Anhui Center for Fundamental Sciences in Theoretical Physics, University of Science and Technology of China（中国科学技术大学安徽理论物理基础科学中心）
Hybrid Device Design for a Pump-Free Microwave-Optical Bell-Pair Source
Pritzker School of Molecular Engineering, University of Chicago（芝加哥大学普里茨克分子工程学院）；Department of Physics, University of Chicago（芝加哥大学物理系）；James Franck Institute, University of Chicago（芝加哥大学詹姆斯·弗兰克研究所）
Quantum-Classical Hybrid Algorithm for Solving the Learning-With-Errors Problem on NISQ Devices
Beijing Academy of Quantum Information Sciences（北京量子信息科学研究院）；State Key Laboratory of Low-Dimensional Quantum Physics and Department of Physics, Tsinghua University（清华大学物理系低维量子物理国家重点实验室）；State Key Laboratory of Mathematical Engineering and Advanced Computing（数学工程与先进计算国家重点实验室）；Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University（南洋理工大学物理与数学科学学院物理与应用物理系）
