Floquet准粒子对Frozonium的毒化作用
Floquet Quasiparticle Poisoning of Frozonium
AI总结：
本文研究周期性驱动产生的frozonium电路，发现其动态冻结无法抑制准粒子耗散，通过Floquet框架分析准粒子过程，确定需平衡动态冻结与准粒子损耗以识别安全驱动参数。
AI中文摘要：
周期性驱动可抑制通量量子比特（fluxonium）超导电路的约瑟夫森非线性，在孤立的冻结点产生近乎谐波的Floquet谱[K. Lewellen等人，Newton 2，100434（2026）]。本文表明，这种动态冻结行为通常不会抑制所得frozonium电路中准粒子诱导的耗散。我们采用Floquet框架构建frozonium中的准粒子过程，分析驱动辅助的库珀对断裂和现有准粒子的隧穿：对产生由高驱动频率下的能隙断裂阈值控制，而多光子共振在较低频率下会产生显著的速率增强；准粒子隧穿呈现由冻结点附近的谐波Floquet-Magnus谱组织的连通共振结构，共振杂化产生特征性的避免交叉。我们的结果表明，合适的工作区域必须平衡动态冻结与准粒子损耗，并提供了一种框架以识别远离有害共振的实验驱动参数。
英文摘要：
Periodic driving can suppress the Josephson nonlinearity of a fluxonium superconducting circuit, producing a nearly harmonic Floquet spectrum at isolated freezing points [K. Lewellen et al., Newton 2, 100434 (2026)]. Here we show that this dynamically frozen behavior does not generically suppress quasiparticle-induced dissipation in the resulting frozonium circuit. We formulate quasiparticle processes in the frozonium using a Floquet framework and analyze both drive-assisted Cooper-pair breaking and tunneling of pre-existing quasiparticles. Pair generation is controlled by gap-breaking thresholds at high drive frequencies, while multiphoton resonances produce pronounced rate enhancements at lower frequencies. Quasiparticle tunneling exhibits connected resonance structures organized by the harmonic Floquet-Magnus spectrum near the freezing point, with resonant hybridization generating characteristic avoided crossings. Our results show that suitable operating regimes must balance dynamical freezing against quasiparticle loss and provide a framework for identifying experimental drive parameters away from harmful resonances.
