Brubaker B M, Zhong L, Gurevich Y V, Cahn S B, Lamoreaux S K, Simanovskaia M, Root J R, Lewis S M, Al Kenany S, Backes K M, Urdinaran I, Rapidis N M, Shokair T M, van Bibber K A, Palken D A, Malnou M, Kindel W F, Anil M A, Lehnert K W, Carosi G
Department of Physics, Yale University, New Haven, Connecticut 06511, USA.
Department of Nuclear Engineering, University of California Berkeley, Berkeley, California 94720, USA.
Phys Rev Lett. 2017 Feb 10;118(6):061302. doi: 10.1103/PhysRevLett.118.061302. Epub 2017 Feb 9.
We report on the first results from a new microwave cavity search for dark matter axions with masses above 20 μeV. We exclude axion models with two-photon coupling g_{aγγ}≳2×10^{-14} GeV^{-1} over the range 23.55<m_{a}<24.0 μeV. These results represent two important achievements. First, we have reached cosmologically relevant sensitivity an order of magnitude higher in mass than any existing limits. Second, by incorporating a dilution refrigerator and Josephson parametric amplifier, we have demonstrated total noise approaching the standard quantum limit for the first time in an axion search.
我们报告了一项新的微波腔暗物质轴子搜索的首批结果，该搜索针对质量高于20 μeV的轴子。我们排除了双光子耦合g_{aγγ}≳2×10^{-14} GeV^{-1}的轴子模型，质量范围为23.55<m_{a}<24.0 μeV。这些结果代表了两项重要成果。首先，我们已达到与宇宙学相关的灵敏度，质量比任何现有限制高出一个数量级。其次，通过采用稀释制冷机和约瑟夫森参量放大器，我们在轴子搜索中首次证明总噪声接近标准量子极限。
