通过超导性调节表面声波生成
Modulating Surface Acoustic Wave Generation through Superconductivity
AI总结：
本研究利用NbN梳状电极和布拉格反射器，在高频到低频范围内生成SAWs，通过超导与正常态的过渡实现对传输特性的精细控制，展示了16倍的传输差异。
摘要：
表面声波（SAWs）以其五量级更慢的传播速度，允许在相同频率下具有更短的波长，相比电磁波。短波长允许设备微型化和芯片集成。这些设备的通用设计涉及具有梳状电极阵列的压电基板，这些电极被称为梳状电极，沉积在表面。然而，铝和金在用于量子应用所需的低温下都有缺陷，即形成双能级系统和缺乏超导性导致持续的欧姆损耗。在本工作中，使用氮化铌（NbN）梳状电极（IDTs）和布拉格反射器，在高频到低频范围内生成SAWs。我们通过光刻和等离子体刻蚀（RIE）展示了声学设备的制造。超导和正常态之间的尖锐过渡以及相应的SAW传输变化允许对NbN的'开'（超导）和'关'（正常）状态进行精细控制，Δ_T = K 分离传输最小值和最大值。我们展示了设备'开'和'关'状态之间的传输差异为16倍。SAW传输行为与NbN在Tc处的电阻变化相吻合。这些发现为将NbN SAW谐振器整合到基于NbN的现有量子架构中开辟了新可能性，并提供了一种不依赖施加电压的调整传输特性的方法。
英文摘要：
Surface acoustic waves (SAWs), with their five orders-of-magnitude slower propagation velocity, allow for considerably shorter wavelengths at the same frequency compared to electromagnetic waves. The short wavelengths allow for device miniaturization and on-chip integration. The generic design of these devices involve piezoelectric substrates with comblike arrays of Al or Au electrodes known as interdigitated transducers deposited on the surface. However, Al and Au both have shortcomings at the cryogenic temperatures required for quantum applications, namely the formation of two-level systems and the lack of superconductivity perpetuating Ohmic losses, respectively. In this work, SAWs are generated in the high-MHz to low-GHz range using niobium nitride (NbN) interdigitated transducers (IDTs) and Bragg reflectors. We demonstrate the fabrication of acoustic devices through photolithography and reactive ion etching (RIE). The sharp transition between superconducting and normal states and the corresponding change in SAW transmission allows for fine control of the 'on' (superconducting) and 'off' (normal) states of NbN, with a Δ_T = K separating the transmission minimum and maximum. We demonstrate a 16x difference in transmission between the 'on' and 'off' states of the device. The SAW transmission behavior mirrors the change in resistance of NbN at its Tc. These findings open up new possibilities for the integration of NbN SAW resonators into existing quantum architectures based on NbN and a method for adjusting transmission properties independent of applied voltage.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
