论文标题
声子下调效率之间的相互作用，费米能量的状态密度和微波运动电感检测器的内在能量分辨率
Interplay between phonon downconversion efficiency, density of states at Fermi energy, and intrinsic energy resolution for microwave kinectic inductance detectors
论文作者
论文摘要
微波动力电感检测器（MKID）已被认为是单个光子检测的强大新工具。这些高度多路复用的超导设备可为每个检测到的光子提供时间和能量测量。但是，尚未达到MKID单光子光谱的全部电位，所达到的能量分辨率低于第一原理的预期。在这里，我们研究了在MKID中吸收能量光子后，声子下调过程的效率。假设先前发表的材料属性，我们测量了三个TIN谐振器的平均下调效率为$η$ = 0.14。我们讨论了这种效率如何影响MKID的内在能量分辨率，以及在费米能量的电子状态未知密度的任何不确定性如何直接影响效率估计。
Microwave Kinetic Inductance detectors (MKIDs) have been recognized as a powerful new tool for single photon detection. These highly multiplexed superconducting devices give timing and energy measurement for every detected photon. However, the full potential of MKID single photon spectroscopy has not been reached , the achieved energy resolution is lower than expected from first principles. Here, we study the efficiency in the phonon downconversion process following the absorption of energetic photons in MKIDs. Assuming previously published material properties, we measure an average downconversion efficiency for three TiN resonators is $η$=0.14. We discuss how this efficiency can impact the intrinsic energy resolution of MKID, and how any uncertainty in the unknown density of electron states at the Fermi energy directly affects the efficiency estimations.
