A quantum module with all-to-all gates via parametric control*

For quantum computing in the NISQ era, most platforms for superconducting systems, including surface code, employ a network of two-body interactions between nearest-neighbor qubits. Alternatively, modular quantum computers seek to create networks with dense local couplings among small 'quantum modules' which are in turn connected via a quantum bus. In this talk, we present such a quantum module comprised of a central Superconducting Nonlinear Asymmetric Inductive eLement (SNAIL) coupled with four transmon qubits. Two-qubit interactions are created via three-wave coupling driving the SNAIL at the difference frequency of a pair of qubits. The module's architecture allows us to realize all-to-all two-qubit couplings with experimental SWAP times of ~100 ns in our prototype. Moreover, we can also drive single qubit gates in the module as fast as ~20 ns by driving the central SNAIL at one half of each qubit's resonant frequency, allowing the entire module's gates to be implemented via a single drive line. The module is also directly compatible with our previously realized quantum state router (C. Zhou, et al. arXiv (2021)).  We will present data characterizing the device's performance and discuss the prospects for its integration into larger-scale modular quantum machines.