Pith Number

pith:PACD7HDB

pith:2010:PACD7HDB5VQO5DLJUZRNEI4PYL

not attested not anchored not stored refs pending

General optimality of the Heisenberg limit for quantum metrology

Carlos A. Perez-Delgado, Marcin Zwierz, Pieter Kok

arxiv:1004.3944 v3 · 2010-04-22 · 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{PACD7HDB5VQO5DLJUZRNEI4PYL}

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	2026-05-18T04:36:49.194252Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

78043f9c61ed60ee8d69a662d2238fc2f035ab49d2312eb3af8427c47cc0734d

Aliases

arxiv: 1004.3944 · arxiv_version: 1004.3944v3 · doi: 10.48550/arxiv.1004.3944 · pith_short_12: PACD7HDB5VQO · pith_short_16: PACD7HDB5VQO5DLJ · pith_short_8: PACD7HDB

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/PACD7HDB5VQO5DLJUZRNEI4PYL \
  | 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: 78043f9c61ed60ee8d69a662d2238fc2f035ab49d2312eb3af8427c47cc0734d

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "dfa1da6a310ad9aabe4eb920128dd46bfa655082e6d10e3ff457fd6e2f6f1a19",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "quant-ph",
    "submitted_at": "2010-04-22T15:19:09Z",
    "title_canon_sha256": "1c7a7532cc20a1753b9bf94de85364c609059d68bdbe35e2e005d218c4105559"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1004.3944",
    "kind": "arxiv",
    "version": 3
  }
}