Pith Number

pith:A7O4DX3X

pith:2012:A7O4DX3XFWDLSXPLN5ZII7XJIX

not attested not anchored not stored refs pending

The elusive Heisenberg limit in quantum enhanced metrology

Jan Kolodynski, Madalin Guta, Rafal Demkowicz-Dobrzanski

arxiv:1201.3940 v2 · 2012-01-18 · 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{A7O4DX3XFWDLSXPLN5ZII7XJIX}

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.

Cited by

1 paper in Pith

Precision limits for time-dependent quantum metrology under Markovian noise

Receipt and verification

First computed	2026-05-18T03:45:23.090136Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

07ddc1df772d86b95deb6f72847ee945eafbc8202f57b9796a48c46b6aa293f0

Aliases

arxiv: 1201.3940 · arxiv_version: 1201.3940v2 · doi: 10.48550/arxiv.1201.3940 · pith_short_12: A7O4DX3XFWDL · pith_short_16: A7O4DX3XFWDLSXPL · pith_short_8: A7O4DX3X

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/A7O4DX3XFWDLSXPLN5ZII7XJIX \
  | 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: 07ddc1df772d86b95deb6f72847ee945eafbc8202f57b9796a48c46b6aa293f0

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "169811b7a2762c068999013d59a0cbfa86a273b2530348c1d81a5176aff7126d",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "quant-ph",
    "submitted_at": "2012-01-18T22:13:28Z",
    "title_canon_sha256": "cb36d23cee2fe926a4e19c32b20e371d6a994f28968b3675dea7e4a5d12a9166"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1201.3940",
    "kind": "arxiv",
    "version": 2
  }
}