General purpose multiplexing device for cryogenic microwave systems

Understand

We introduce and experimentally characterize a general purpose device for signal processing in circuit quantum electrodynamics systems.

• The device is a broadband two-port microwave circuit element with three modes of operation: it can transmit, reflect, or invert incident signals between 4 and 8 GHz.
• This property makes it a versatile tool for lossless signal processing at cryogenic temperatures.
• In particular, rapid switching (less than or equal to 15 ns) between these operation modes enables several multiplexing readout protocols for superconducting qubits.