论文标题
在非平衡超导体中抑制活性准粒子
Active quasiparticle suppression in a non-equilibrium superconductor
论文作者
论文摘要
准颗粒（QP）中毒是损害各种超导装置运行的主要问题。即使这些设备通常在温度下运行，远低于临界点，预计激发的数量密度将被指数抑制，但它们的裸露操作和流浪微波辐射激发了非平衡QPS。在这里，我们使用电压偏置的超导连接连接来证明和量化QP提取，以在超导体 - 绝缘体正常金属绝缘体 - 螺旋体单电子晶体管的旋转门操作中进行QP提取。在此操作中，将激发注入与驾驶频率成正比的超导导线中。即使在开口时，我们即使最高的注入速率每秒降低了一个数量级的降低。
Quasiparticle (qp) poisoning is a major issue that impairs the operation of various superconducting devices. Even though these devices are often operated at temperatures well below the critical point where the number density of excitations is expected to be exponentially suppressed, their bare operation and stray microwave radiation excite the non-equilibrium qps. Here we use voltage-biased superconducting junctions to demonstrate and quantify qp extraction in the turnstile operation of a superconductor-insulator-normal metal-insulator-superconductor single-electron transistor. In this operation regime excitations are injected into the superconducting leads at a rate proportional to the driving frequency. We reach a reduction of density by an order of magnitude even for the highest injection rate of $2.4\times 10^8$ qps per second when extraction is turned on.
