The Pinnacle Architecture with fixed connectivity of degree eight

We show how the Pinnacle architecture can be adapted to be compatible with superconducting qubits, where the connectivity between qubits must be fixed at fabrication. Specifically, we present a modified instantiation of the architecture that has fixed connectivity degree of eight. With this instantiation, we show that a 2048-bit RSA integer can be factored in one month with approximately 120 000 physical qubits, given a physical error rate of ${10}^{-3}$, code cycle time of 1 microsecond and reaction time of 10 microseconds.