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,