论文标题
超导谐振器中两级系统的波动光谱
Fluctuation Spectroscopy of Two-Level Systems in Superconducting Resonators
论文作者
论文摘要
超导量子计算正在经历巨大的增长。尽管已经实现了主要的里程碑，但有用的量子计算应用受到各种破坏现象的阻碍。由于两级系统（TLSS）引起的破坏性在平面超导装置中无处不在。我们使用高质量的准元素谐振器作为量子传感器，以研究TLS诱导的损失和噪声。我们使用探针和泵电场进行两色调实验。该泵在不同的功率水平和引人入胜。我们在很长一段时间内测量和分析质量因子和共振频率的时间序列，最高1000小时。我们还基于在泵场的存在下基于TLS相互作用模型进行模拟。我们发现，在中等和高功率下，损失和噪声降低，与模拟匹配，但在低功率下不匹配。
Superconducting quantum computing is experiencing a tremendous growth. Although major milestones have already been achieved, useful quantum-computing applications are hindered by a variety of decoherence phenomena. Decoherence due to two-level systems (TLSs) hosted by amorphous dielectric materials is ubiquitous in planar superconducting devices. We use high-quality quasilumped element resonators as quantum sensors to investigate TLS-induced loss and noise. We perform two-tone experiments with a probe and pump electric field; the pump is applied at different power levels and detunings. We measure and analyze time series of the quality factor and resonance frequency for very long time periods, up to 1000 h. We additionally carry out simulations based on the TLS interacting model in presence of a pump field. We find that loss and noise are reduced at medium and high power, matching the simulations, but not at low power.
