Characterization of superconducting diodes in quantum circuits

Nonreciprocal microwave devices are crucial for scalable superconducting quantum computing, particularly in addressing challenges related to qubit overhead, signal routing, and decoherence. Conventional implementations of nonreciprocity rely on bulky magnetic materials or multi-qubit schemes, both of which are incompatible with dense on-chip integration and can introduce detrimental back-action. Here we introduce superconducting diodes, akin to the historical emergence of semiconducting diodes, as multi-handle control nonreciprocal elements for modular quantum circuits. With nonreciprocity based on intrinsic system response these devices enable capabilities to embed on-chip nonreciprocities at fab stage. In the first step, we will demonstrate how to characterize superconducting diodes as lumped element circuits.