Modular tunable coupler for superconducting qubits

Tunable coupling elements in superconducting quantum circuits enable fast and high fidelity interactions and have become ubiquitous in quantum processors. Such tunable elements need to provide a combination of high coupling rates and low parasitic (such as ZZ) interactions. Moreover, the circuit needs to be insensitive to variation in the data qubit parameters to enable a modular design of multi-qubit circuits and lower simulation complexity. Here we describe the theory and initial experimental results of a dual ancilla coupler that mediates the interaction between two data transmons. The ancilla transmons are strongly hybridized to enable first order insensitivity to circuit parameters and ZZ interaction cancellation. Our coupler allows static as well as parametric interactions and it is therefore suitable for a variety of superconducting qubit platforms.