We consider the interaction of a magnetically trapped Bose–Einstein condensate of Rubidium atoms with the stationary microwave radiation field sustained by a coplanar waveguide resonator. This coupling allows for the measurement of the magnetic field of the resonator by means of counting the atoms that fall out of the condensate due to hyperfine transitions to non-trapped states. We determine the quantum efficiency of this detection scheme and show that weak microwave fields at the single-photon level can be sensed.

中文翻译：

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用玻色-爱因斯坦凝聚物感测微波光子

我们考虑了磁捕获的trap原子的玻色-爱因斯坦凝聚物与由共面波导谐振器维持的固定微波辐射场之间的相互作用。这种耦合允许通过对由于超精细跃迁到非俘获状态而从冷凝物中掉出的原子进行计数来测量谐振器的磁场。我们确定了这种检测方案的量子效率，并表明可以检测到单光子水平的弱微波场。