Pith Number

pith:TPRYTPJA

pith:2022:TPRYTPJA2AABPQK4XG54CH5LJ3

not attested not anchored not stored refs pending

Only Classical Parameterised States have Optimal Measurements under Least Squares Loss

David Arvidsson-Shukur, Sergii Strelchuk, Wilfred Salmon

arxiv:2205.14142 v2 · 2022-05-27 · quant-ph

Open paper page JSON Open Graph Bundle Merged state Verified badge What is a Pith Number?

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{TPRYTPJA2AABPQK4XG54CH5LJ3}

Prints a linked badge after your title and injects PDF metadata. Compiles on arXiv. Learn more · Embed verified badge

Record completeness

1 Bitcoin timestamp

2 Internet Archive

3 Author claim open · sign in to claim

4 Citations open

5 Replications open

✓ Portable graph bundle live · download bundle · merged state

The bundle contains the canonical record plus signed events. A mirror can host it anywhere and recompute the same current state with the deterministic merge algorithm.

Receipt and verification

First computed	2026-07-05T06:10:16.404698Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

9be389bd20d00017c15cb9bbc11fab4ec1c9f0ea9380f2eb8a80353f6632bde3

Aliases

arxiv: 2205.14142 · arxiv_version: 2205.14142v2 · doi: 10.48550/arxiv.2205.14142 · pith_short_12: TPRYTPJA2AAB · pith_short_16: TPRYTPJA2AABPQK4 · pith_short_8: TPRYTPJA

Agent API

Resolver JSON Graph JSON Events JSON Schema Signing key

Verify this Pith Number yourself

curl -sH 'Accept: application/ld+json' https://pith.science/pith/TPRYTPJA2AABPQK4XG54CH5LJ3 \
  | jq -c '.canonical_record' \
  | python3 -c "import sys,json,hashlib; b=json.dumps(json.loads(sys.stdin.read()), sort_keys=True, separators=(',',':'), ensure_ascii=False).encode(); print(hashlib.sha256(b).hexdigest())"
# expect: 9be389bd20d00017c15cb9bbc11fab4ec1c9f0ea9380f2eb8a80353f6632bde3

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "7ea9427943d841ea5e1bbf4f96253a8a597515e89563bc1821ba9bce635358fd",
    "cross_cats_sorted": [],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "primary_cat": "quant-ph",
    "submitted_at": "2022-05-27T17:59:53Z",
    "title_canon_sha256": "961f618b07c450af79653208a95a6c9ebed64007379694f8056355249ecf647c"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2205.14142",
    "kind": "arxiv",
    "version": 2
  }
}