Quantum

Exploring Quantum Phase Transitions Beyond Landau Theory on a Quantum Processor

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Based on a feed excerpt; full article content has not been acquired. Source evidence retrieved 19/10/2026, 04:13:24 UTC.

Briefings

A new quantum processor study investigates a Landau-forbidden ferromagnetic-to-valence-bond-solid (FM-VBS) transition in a frustrated one-dimensional spin chain. Using matrix-product-state-assisted circuit preparation and hardware measurements, researchers resolved the suppression of long-range ferromagnetic correlations and observed critical behavior consistent with deconfined quantum criticality. The study extends to nonequilibrium dynamics, directly preparing dimerized states and tracking VBS order evolution under local unitary interactions.

Key points

• Researchers used a quantum processor to investigate a Landau-forbidden ferromagnetic-to-valence-bond-solid (FM-VBS) transition in a frustrated one-dimensional spin chain.
• Distance-resolved correlations and finite-size analyses revealed signatures consistent with critical behavior, resolving the suppression of long-range ferromagnetic correlations.

Context

This research addresses a fundamental challenge in condensed matter physics by probing competing orders and many-body dynamics beyond conventional Landau theory, utilizing a versatile quantum-hardware framework for deconfined quantum criticality.

Limitations

The study relies on a single preprint snapshot from October 2026, with no additional experimental data or follow-up results provided to confirm the stability of these findings.

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