Scaling qubit-resonator architectures for co-design quantum computing

Qubit-resonator quantum processing units (QPUs) are a promising architecture to enhance connectivity and realized applications specific processors in the co-design concept. Compared to a square lattice of qubits, a resonator can naturally couple to more qubits and over a greater distance. Considering many-body problems which map onto a Hamiltonian with all-to-all interacting qubits, we implement a star-topology with many qubits coupled to a central resonator. The prototypical example of this architecture is the simulation of a nanoscale NMR system consisting of an NV center coupled to multiple nuclear spins. Compared to the general-purpose square-grid topology, the star reduces the number of SWAP gates in the algorithm implementation, and thus tolerates higher gate errors for a given computational precision [1]. Here we present our results scaling the number of qubits coupled to the central resonator. We characterize our qubit-resonator QPU, and present an outlook of the future of qubit-resonator architectures for co-design quantum computing.

[1] Manuel G. Algaba & Mario Ponce-Martinez, et. al., Phys. Rev.