Characterizing cryogenic amplifiers with a matched temperature-variable noise source
Slawomir Simbierowicz, Visa Vesterinen, Joshua Milem, Aleksi Lintunen, Mika Oksanen, Leif Roschier, Leif Grönberg, Juha Hassel, David Gunnarsson, Russell E. Lake
备注：
The following article has been accepted by Review of Scientific Instruments. After it is published, it will be found at https://doi.org/10.1063/5.0028951
We present a cryogenic microwave noise source with a characteristic impedance of 50 $Ω$, which can be installed in a coaxial line of a cryostat. The bath temperature of the noise source is continuously variable between 0.1 K and 5 K without causing significant back-action heating on the sample space. As a proof-of-concept experiment, we perform Y-factor measurements of an amplifier cascade that includes a traveling wave parametric amplifier and a commercial high electron mobility transistor amplifier. We observe system noise temperatures as low as $680^{+20}_{-200}$ mK at 5.7 GHz corresponding to $1.5^{+0.1}_{-0.7}$ excess photons. The system we present has immediate applications in the validation of solid-state qubit readout lines.
California Institute of Technology（加州理工学院）；National Institute of Standards and Technology（美国国家标准与技术研究院）；University of Colorado, Boulder（科罗拉多大学博尔德分校）；University of Milano-Bicocca（米兰比可卡大学）
Revisiting Thermal Scalability for Large-Scale Superconducting Quantum Systems
Faculty of Information Science and Electrical Engineering, Kyushu University（九州大学信息科学与电气工程学院）；Secure System Platform Research Laboratories, NEC Corporation（NEC公司安全系统平台研究实验室）；Global Research and Development Center for Business by Quantum-AI Technology (G-QuAT), National Institute of Advanced Industrial Science and Technology (AIST)（国立产业技术综合研究所量子AI技术商业研发中心）；Advanced Technology Center, National Astronomical Observatory of Japan (NAOJ)（日本国立天文台先进技术中心）；Graduate University for Advanced Studies (SOKENDAI)（综合研究大学院大学）
The noise cost of reservoir locality in broadband quantum amplifier chains
Beijing Institute of Petrochemical Technology（北京石油化工学院）；Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences（中国科学院物理研究所，凝聚态物理国家实验室）；Faculty of Science, Kunming University of Science and Technology（昆明理工大学理学院）；State Key Laboratory of Optoelectronic Materials and Technologies, School of Physics, Sun Yat-Sen University（中山大学物理学院，光电材料与技术国家重点实验室）；Jining University（济宁学院）
Wideband Josephson Parametric Amplifier with Integrated Transmission Line Transformer
本文介绍了一种利用集成紧凑型超导传输线Transformer实现阻抗匹配的宽带约瑟夫森参量放大器。阻抗Transformer由两条宽边耦合传输线组成，采用Ruthroff拓扑结构，能够实现2至18 GHz的宽匹配带宽，将输入线阻抗和器件谐振品质因数降低4倍。这使得增益平坦度和灵活性的选择放大器的调谐范围。该放大器具有高达20 dB的增益，纹波小于1dB，2- 3GHz的增益带宽积和-126dBm的输入1dB压缩点。此外，该器件的有源区适合1 mm x 1 mm的空间，从而易于集成到大型量子系统中。
Three-Wave Mixing Element with Quantum Paraelectric Materials
Stanford University（斯坦福大学）；Sygaldry Technologies（西格尔德技术公司）；University of Chicago（芝加哥大学）；Q-NEXT, Argonne National Laboratory（Q-NEXT，阿贡国家实验室）；University of Illinois Urbana-Champaign（伊利诺伊大学厄巴纳-香槟分校）
A near-quantum-limited diamond maser amplifier operating at millikelvin temperatures
Okinawa Institute of Science and Technology Graduate University（冲绳科学技术大学院大学）；National Tsing Hua University（国立清华大学）；Delft University of Technology（代尔夫特理工大学）；QuTech and Kavli Institute of Nanoscience（QuTech与卡弗里纳米科学研究所）；Liquid Instruments（液体仪器公司）；Brown University（布朗大学）
Hybrid non-degenerate parametric amplifier for a microwave cavity mode and an NV ensemble
Akhiezer Institute for Theoretical Physics, NSC KIPT（阿基谢尔理论物理研究所，NSC KIPT）；Advanced Photonics and Electronics Division, U.S. Army DEVCOM Army Research Laboratory（先进光子学与电子学部门，美国陆军DEVCOM陆军研究实验室）；Department of Physics, University of Massachusetts at Boston（马萨诸塞大学波士顿分校物理系）；Education and Research Institute “School of Physics and Technology”, Karazin Kharkiv National University（卡尔齐诺夫哈尔科夫国立大学教育与研究所“物理与技术学院”）；Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology（麻省理工学院电气与计算机工程系）；Department of Physics and Engineering Physics, Tulane University（杜兰大学物理与工程物理系）
Optimising Cryogenic Wiring for Microwave-frequency Millikelvin Quantum Processors
Sydney Quantum Academy（悉尼量子学院）；Centre for Quantum Software & Information, School of Mathematical & Physical Sciences, University of Technology Sydney（悉尼科技大学数学与物理科学学院量子软件与信息研究中心）
Cryogenic rf-to-microwave transducer based on a dc-biased electromechanical system
Laboratoire Kastler Brossel, Sorbonne Université, CNRS, ENS–Université PSL, Collège de France（卡斯勒-布罗塞尔实验室，索邦大学，法国国家科学研究中心，巴黎高等师范学院-巴黎文理研究大学，法兰西公学院）；Alice & Bob（爱丽丝与鲍勃公司）；Niels Bohr Institute, University of Copenhagen（尼尔斯·玻尔研究所，哥本哈根大学）；Center for Hybrid Quantum Networks (Hy-Q), Niels Bohr Institute, University of Copenhagen（混合量子网络中心（Hy-Q），尼尔斯·玻尔研究所，哥本哈根大学）；Institut Universitaire de France (IUF)（法国高等研究院）
