Quantum-Computing Architecture based on Large-Scale Multi-Dimensional Continuous-Variable Cluster States in a Scalable Photonic Platform

Quantum computing is a disruptive paradigm widely believed to be capable of solving classically intractable problems, but the route toward full-scale quantum computers is impeded by immense challenges associated with the scalability of the platform and the required fidelity of various components. One-way quantum computing is an appealing approach that shifts the burden from high-fidelity quantum gates and quantum memories to the generation of high-quality entangled resource states and high fidelity measurements. Here, we bridge two fields—Kerr microcombs and continuous-variable (CV) quantum information—to formulate a one-way quantum computing architecture based on programmable large-scale CV cluster states. The architecture accommodate hundreds of simultaneously addressable entangled optical modes multiplexed in frequency and an unlimited number of sequentially addressable entangled modes in time. One-, two-, three-dimensional CV cluster states can be deterministically produced, which allows for fault-tolerant one-way quantum computing with known error-correction strategies. This architecture opens a promising avenue for quantum computing at a large scale.