标题： Gatemon量子比特的重新审视以提高可靠性和稳定性 显示英文标题

标题： Gatemon Qubit Revisited for Improved Reliability and Stability

摘要： 基于混合超导-半导体约瑟夫森结的量子电路的发展，有望探索其介观物理并构建新型超导器件。门控可调的超导transmon量子比特（gatemon）是这种超导电路的典型例子。然而，gatemons通常会因施加的门电压而出现不稳定和滞后的量子比特频率以及缩短的退相干时间。在这里，我们开发了表征这些gatemon挑战的方法，并部署这些方法来比较分流电容器设计对gatemon性能的影响。我们的结果表明，量子比特的稳定性、滞后性和去相时间具有强烈的频率和设计依赖性。此外，我们在几GHz的范围内实现了具有1 MHz精度的量子比特频率的高可靠性调节，并且与浮动电容器设计的gatemons相比，接地的gatemons表现出更好的稳定性。 显示英文摘要

摘要： The development of quantum circuits based on hybrid superconductor-semiconductor Josephson junctions holds promise for exploring their mesoscopic physics and for building novel superconducting devices. The gate-tunable superconducting transmon qubit (gatemon) is the paradigmatic example of such a superconducting circuit. However, gatemons typically suffer from unstable and hysteretic qubit frequencies with respect to the applied gate voltage and reduced coherence times. Here we develop methods for characterizing these challenges in gatemons and deploy these methods to compare the impact of shunt capacitor designs on gatemon performance. Our results indicate a strong frequency- and design-dependent behavior of the qubit stability, hysteresis, and dephasing times. Moreover, we achieve highly reliable tuning of the qubit frequency with 1 MHz precision over a range of several GHz, along with improved stability in grounded gatemons compared to gatemons with a floating capacitor design.