使用约瑟夫森混频器的回转器操作
Gyrator operation using Josephson mixers
摘要：
非互易微波器件，如循环器，在量子网络中路由量子信号和保护量子系统免受来自检测链的噪声影响方面很有用。然而，目前使用的商用低温循环器由于其可观的尺寸、损耗和固有磁场而不适合于可扩展的超导量子架构。我们报告一个关键的非互易元素的测量，即，回转器，它可以用来实现循环器。与使用磁光效应在相反方向上的传输信号之间引起$π$相移的最先进的回转器不同，我们的设备使用基于约瑟夫森的三波混频设备的相位非互易性。通过耦合这些混频器中的两个，并在无噪声频率转换模式下操作它们，我们表明，该设备作为一个非互易移相器，其相移是由驱动混频器的微波音调的相位差控制。这种器件可用于实现适用于量子信息处理应用的无损片上超导环行器。
英文摘要：
Nonreciprocal microwave devices, such as circulators, are useful in routing quantum signals in quantum networks and protecting quantum systems against noise coming from the detection chain. However, commercial, cryogenic circulators, now in use, are unsuitable for scalable superconducting quantum architectures due to their appreciable size, loss, and inherent magnetic field. We report on the measurement of a key nonreciprocal element, i.e., the gyrator, which can be used to realize a circulator. Unlike state-of-the-art gyrators, which use a magneto-optic effect to induce a phase shift of $π$ between transmitted signals in opposite directions, our device uses the phase nonreciprocity of a Josephson-based three-wave-mixing device. By coupling two of these mixers and operating them in noiseless frequency-conversion mode, we show that the device acts as a nonreciprocal phase shifter whose phase shift is controlled by the phase difference of the microwave tones driving the mixers. Such a device could be used to realize a lossless, on-chip, superconducting circulator suitable for quantum-information-processing applications.
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