Ryu Younghun, Jeong Jinhoon, Suh Junho, Kim Jihwan, Choi Hyoungsoon, Cha Jinwoong
Quantum Technology Institute, Korea Research Institute of Standards and Science (KRISS), Daejeon 34113, South Korea.
Department of Physics, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, South Korea.
Nano Lett. 2024 Jan 31;24(4):1223-1230. doi: 10.1021/acs.nanolett.3c04080. Epub 2024 Jan 17.
Hybridizing a microwave mode with a quantum state requires precise frequency matching of a superconducting microwave resonator and the corresponding quantum object. However, fabrication always brings imperfections in geometry and material properties, causing deviations from the desired operating frequencies. An effective and universal strategy for their resonant coupling is to tune the frequency of a resonator, as quantum states like phonons are hardly tunable. Here, we demonstrate gate-tunable, titanium-nitride (TiN)-based superconducting resonators by implementing a nanowire inductor whose kinetic inductance is tuned via the gate-controlled supercurrent (GCS) effect. We investigate their responses for different gate biases and observe 4% (∼150 MHz) frequency tuning with decreasing internal quality factors. We also perform temperature-controlled experiments to support phonon-related mechanisms in the GCS effect and the resonance tuning. The GCS effect-based method proposed in this study provides an effective route for locally tunable resonators that can be employed in various hybrid quantum devices.
将微波模式与量子态进行耦合需要超导微波谐振器与相应量子对象的精确频率匹配。然而，制造过程总会在几何形状和材料特性方面带来缺陷，导致与期望的工作频率产生偏差。对于它们的共振耦合，一种有效且通用的策略是调节谐振器的频率，因为像声子这样的量子态几乎无法调节。在此，我们通过实现一种纳米线电感器来展示基于氮化钛（TiN）的栅极可调超导谐振器，该纳米线电感器的动态电感通过栅极控制超电流（GCS）效应进行调节。我们研究了它们在不同栅极偏置下的响应，并观察到随着内部品质因数的降低，频率可调谐4%（约150兆赫兹）。我们还进行了温度控制实验，以支持GCS效应和共振调谐中与声子相关的机制。本研究中提出的基于GCS效应的方法为可用于各种混合量子器件的局部可调谐振器提供了一条有效途径。
