aiqbench takeQuantum Computing

IBM has demonstrated the ability to simulate a 100-site spin chain on its quantum processor by utilizing shallow circuits and tensor-network-based compiling techniques. This achievement allows for the direct measurement of non-local diagnostics, such as string order, which are critical for characterizing symmetry-protected topological phases in complex quantum matter. The result validates digital quantum devices as scalable platforms for studying phenomena that were previously inaccessible to traditional experimental methods or limited by entanglement constraints.

Source coveringQuantum Zeitgeist

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IBM chip runs a 100-site spin chain to probe quantum matter

Quantum ZeitgeistSeptember 1, 20265 min read

Researchers used an IBM chip to run a 100-site spin chain, probing symmetry-protected topological phases of quantum matter—a feat enabled by shallow circuits with 97.9–99.0% fidelity.

IBM quantum hardware has successfully simulated a 100-site spin chain, achieving 97.9-99.0% fidelity in preparing ground states of the chain, a scale previously limited by the entanglement needed for accurate results. Researchers used a tensor-network-based approximate quantum compiling protocol to construct shallow circuits, with a depth of only 18-39 CNOT gates, to explore symmetry-protected topological (SPT) order. The work directly measured string order for lengths up to 20, persisting beyond the decay of conventional correlations, alongside other non-local diagnostics, offering a new way to characterise these complex quantum states. This establishes digital quantum devices…

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