Pith Number

pith:XQRKQDVQ

pith:2026:XQRKQDVQ2RTP65QNUZOGH3JHCX

not attested not anchored not stored refs pending

A thorium-229 optical nuclear clock with feedback loop

A. Hellerschmied, A. Niessner, B. Gerstenecker, E. Peik, F. Schaden, F. Schneider, G. A. Kazakov, G. Zitzer, H. Denker, I. Morawetz, J. Premper, J. Schlachet-L\'epinay, J. Tiedau, K. Beeks, L. Toscani De Col, M. Bartokos, M. Cizek, M. Matus, M. Pimon, M. V. Okhapkin, N. Sempelmann, O. Cip, S. Lahs, T. Lercher, T. Riebner, T. Schumm, V. Lal, V. Petrov

arxiv:2606.04997 v1 · 2026-06-03 · physics.atom-ph · nucl-ex · 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{XQRKQDVQ2RTP65QNUZOGH3JHCX}

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	2026-06-04T01:10:00.642892Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

bc22a80eb0d466ff760da65c63ed2715ea9860290d4df0cba1be3aaf260fa3a7

Aliases

arxiv: 2606.04997 · arxiv_version: 2606.04997v1 · doi: 10.48550/arxiv.2606.04997 · pith_short_12: XQRKQDVQ2RTP · pith_short_16: XQRKQDVQ2RTP65QN · pith_short_8: XQRKQDVQ

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/XQRKQDVQ2RTP65QNUZOGH3JHCX \
  | 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: bc22a80eb0d466ff760da65c63ed2715ea9860290d4df0cba1be3aaf260fa3a7

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "20c8b1bfaa86274be70481f893b057a89ceefce7d4f2338b021090381adba65d",
    "cross_cats_sorted": [
      "nucl-ex",
      "quant-ph"
    ],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "primary_cat": "physics.atom-ph",
    "submitted_at": "2026-06-03T15:15:56Z",
    "title_canon_sha256": "15a09ac81dd53536a6abd874b9782d46deb1d8f38b865eca659e5c11acfcc187"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2606.04997",
    "kind": "arxiv",
    "version": 1
  }
}