Calibration approach for a frequency tunable microwave photon source and detector using a double transmon coupler

Connecting quantum processing modules in a network is an attractive route to scaling quantum computers. With superconducting circuit architectures, it is necessary to develop specialized circuits that interface between long-lived on-chip qubits and waveguides that leave a chip. We use a double transmon coupler (DTC) superconducting circuit architecture as a component of a device that can emit and detect microwave photons in a waveguide, interfacing with a long-lived transmon. The device bandwidth is 1.7 MHz and it may be frequency tuned over several hundred MHz by flux-tuning the DTC's superconducting quantum interference device (SQUID), making the device uniquely narrow band and tunable. Parametrically driving the DTC flux at frequencies resonant with select pairs of states enables detection or emission. Here we present a calibration scheme for efficiently modeling and setting those parametric drive parameters.