data: add Ramacciotti et al. (arXiv 2604.24973) — score 4, notable

[1feems]

Summary

Adds Ramacciotti, Steinbach, Temesi, Lefterovici, Rotundo (arXiv 2604.24973) to the visualizer at rank 64, score 4 (Proactive), notable, pq_work_volume 1.

Why

arXiv 2604.24973 — Approximate Sparse State Preparation with the Grover-Rudolph Algorithm — introduces gate-merging optimizations for quantum state preparation, achieving a ~22% reduction in CNOT gate counts.

• reduces CNOT gate count in Grover-Rudolph state preparation
• lowers circuit depth and coherence-time requirements
• introduces approximate merging with controllable error

State preparation is a core subroutine in quantum search algorithms used in ECDLP attack pipelines. Reducing gate count improves execution efficiency for these circuits, tightening feasibility for secp256k1 cryptanalysis.

This complements prior work (e.g. Gidney baseline, PR #25) by optimizing search subroutines rather than core arithmetic, strengthening another layer of the attack stack.

Sourced from approved quantum signal 8be65500-caef-496b-ace8-f8b286a2ef72.

Changes

• New entry rank 64 in data.json and public/data.json
• update_history entry added (#TBD → fix after merge)
• Metadata sync:
  • total_assessed +1
  • 4_proactive +1
  • notable_additions +1

Verification checklist

• Both files validate as JSON
• Pattern matches research-tier entries
• Source is primary (arXiv)