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One of the primary challenges in realizing large-scale quantum processors isthe realization of qubit couplings that balance interaction strength,connectivity, and mode confinement. Moreover, it is very desirable for thedevice elements to be detachable, allowing components to be built, tested, andreplaced independently. In this work, we present a microwave quantum staterouter, centered on parametrically driven, Josephson-junction based three-wavemixing, that realizes all-to-all couplings among four detachable quantummodules. We demonstrate coherent exchange among all four communication modes,with an average full-iSWAP time of 764ns and average inferred inter-moduleexchange fidelity of 0.969, limited by mode coherence. We also demonstratephoton transfer and pairwise entanglement between module qubits, and paralleloperation of simultaneous iSWAP exchange across the router. Our router-modulearchitecture serves as a prototype of modular quantum computer that has greatpotential for enabling flexible, demountable, large-scale quantum networks ofsuperconducting qubits and cavities.

Realizing all-to-all couplings among detachable quantum modules using a microwave quantum state router