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Learn about a breakthrough low-overhead error detection method for quantum circuits that uses space-time Pauli checks to bridge the gap between error mitigation and full quantum error correction. Discover how inserting lightweight, locally routed Pauli checks throughout Clifford-dominated circuits enables fault detection with minimal additional gates, achieving up to 1000× better post-selection rates and 70% higher fidelity compared to previous approaches. Explore the practical implementation of this technique in creating large graph states and a record-breaking 140-qubit GHZ state, while examining future research directions that combine these checks with probabilistic error cancellation and extend their application to more general quantum circuits.
