QTML 2025: The State Hidden Subgroup Problem (SHSP): Learning stabilizer groups and beyond

QTML 2025: The State Hidden Subgroup Problem (SHSP): Learning stabilizer groups and beyond

🎙 Jose Carrasco 👥 8K 📅 March 12, 2026 ⏱ 15 min 👁 40 📄 conference talk 🧭 2026-08-15
Available in: English (current) Français

Keywords

State Hidden Subgroup Problemquantum learningstabilizer groupssymmetryabelian groups

Summary

The talk introduces the State Hidden Subgroup Problem (SHSP), a quantum generalization of the classical Hidden Subgroup Problem (HSP). In SHSP, the hidden subgroup is encoded in the symmetries of an unknown quantum state, rather than through an oracle function. The speaker, Jose Carrasco, presents a quantum algorithm for abelian groups that efficiently learns the hidden symmetry subgroup using a character POVM, requiring only low-depth circuits and no ancillas. The approach is applied to three concrete problems: learning qubit and qudit stabilizer groups, identifying cuts along which a state is unentangled (entanglement location), and learning hidden translation symmetries. The talk highlights the connection to Bell sampling and discusses open questions, including robustness to noise and the hardness of rank-two entanglement. The presentation is technical and aimed at a quantum information audience.

131 words

Critical Evaluation

Value of the Information & Strength of the Argument

The talk provides a clear and valuable contribution by unifying several quantum learning tasks under the SHSP framework. The argumentation is solid, building on established results in HSP and representation theory. The speaker motivates the problem well and demonstrates the efficiency of the proposed algorithm through concrete examples. The discussion of open problems adds depth and shows the limitations of the current approach.

Scientific Rigor, Source Quality, Title Accuracy

The talk is scientifically rigorous, with precise definitions and references to prior work, including the work by Bolan et al. on entanglement location. The title accurately reflects the content. The speaker does not provide detailed citations during the talk, but the abstract and description mention the authors and the conference. The presentation is concise but technically sound.

135 words

Title / Content Match

The title accurately reflects the content, focusing on the State Hidden Subgroup Problem and its applications to learning stabilizer groups.

Quality & Reliability

8/10

The talk presents original research from a reputable group, with clear mathematical definitions and references to prior work. The speaker is knowledgeable and the content is technically sound, though the presentation is concise and lacks detailed proofs.

Key Moments

Cited Sources

  • QTML 2025 conference — The talk was presented at this conference.
  • Centre for Quantum Technologies — The speaker is affiliated with this institution.

Concurring Sources

  • Bollan et al. (2024) on entanglement location — The speaker references this work as motivation and comparison.

Contribution & Novelties

The talk presents a novel unified framework for quantum learning of symmetries, extending the Hidden Subgroup Problem to the quantum state setting. The proposed algorithm for abelian groups is efficient and requires only low-depth circuits, improving upon previous approaches. The applications to stabilizer learning and entanglement location demonstrate the practical relevance.

Pour aller plus loin :

83 words

Radar Profile

The radar profile shows high scores in technical level and information quality, with slightly lower scores in information quantity and global reliability, reflecting the concise nature of a conference talk.

Reliability 8/10