电压控制的约瑟夫森频率梳
A Voltage-Controlled Josephson Frequency Comb
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中文总结 AI 辅助
研究提出基于约瑟夫森场效应晶体管的频率梳发生器，通过静电控制调节相关参数，可直接电控制梳齿特性，在1 - 10 GHz范围实现连续频率覆盖，与更高临界温度超导体兼容，有望成为低温量子信息和传感应用的微波源。
中文摘要 AI 辅助
微波频率梳在量子技术、低温电子学和多路复用传感架构中是很有前景的资源。本文提出一种基于约瑟夫森场效应晶体管在弛豫振荡模式下工作的频率梳发生器。该器件包括嵌入电阻分流电路中的栅极可调弹道超导 - 半导体 - 超导结，通过静电控制载流子密度可原位调节临界电流和约瑟夫森电感。时域电路模拟表明，产生的振荡器产生相干电压脉冲，其傅里叶频谱形成微波频率梳。与传统基于约瑟夫森的梳状架构不同，该平台通过栅电极可直接电控制梳齿间距、发射频率和模态功率分布。对于典型的Al/InAs实现，展示了在1 - 10 GHz技术相关范围内的连续频率覆盖。此外，该概念与更高临界温度的超导体兼容，凸显其作为用于低温量子信息和传感应用的紧凑且可扩展微波源的潜力。
英文摘要
Microwave frequency combs constitute promising resources for quantum technologies, cryogenic electronics, and multiplexed sensing architectures. In this work, we propose a frequency-comb generator based on a Josephson field-effect transistor operated in a relaxation-oscillation regime. The device comprises a gate-tunable ballistic superconductor-semiconductor-superconductor junction embedded in a resistively shunted circuit, in which electrostatic control of the carrier density enables in situ tuning of both the critical current and the Josephson inductance. Time-domain circuit simulations indicate that the resulting oscillator produces coherent voltage pulses whose Fourier spectrum forms a microwave frequency comb. In contrast to conventional Josephson-based comb architectures, the proposed platform provides direct electrical control of the comb spacing, emission frequencies, and modal power distribution via a gate electrode. For a representative Al/InAs implementation, we demonstrate continuous frequency coverage in the technologically relevant 1-10 GHz range. Furthermore, the concept is shown to be compatible with higher-$T_c$ superconductors, underscoring its potential as a compact and scalable microwave source for cryogenic quantum information and sensing applications.
