Linear-optical quantum computing with high-probability state generation and arbitrary connectivity

We present Xanadu's proposal for a scalable and fault-tolerant photonic quantum computer along with relevant new results. Gottesman-Kitaev-Preskill bosonic qubits for this architecture are generated all-optically with high probability; a shallow network of static beamsplitters then creates universal resources with arbitrary connectivity for fault-tolerant quantum computation. Computation, syndrome data extraction, and final measurement readouts are all achieved using homodyne detectors, which are fast, reliable, accurate, and operate at room temperature. The architecture is based on modular, easy-to-network integrated photonic chips, opening the door to scalable fabrication and operation.