Pith Number

pith:QH4AQWWR

pith:2001:QH4AQWWR6YMIQYGCF6MDOHRWQH

not attested not anchored not stored refs pending

Quantum Zeno tomography

G. Krenn, J. Rehacek, P. Facchi, S. Pascazio, Z. Hradil

arxiv:quant-ph/0104021 v2 · 2001-04-04 · 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{QH4AQWWR6YMIQYGCF6MDOHRWQH}

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

Counterfactual Quantum Sensing: What Interaction-Free Measurement Can and Cannot Buy

Receipt and verification

First computed	2026-07-04T16:28:57.096035Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

81f8085ad1f6188860c22f98371e3681c8af966680a6229e82f73d3e5870b624

Aliases

arxiv: quant-ph/0104021 · arxiv_version: quant-ph/0104021v2 · doi: 10.48550/arxiv.quant-ph/0104021 · pith_short_12: QH4AQWWR6YMI · pith_short_16: QH4AQWWR6YMIQYGC · pith_short_8: QH4AQWWR

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/QH4AQWWR6YMIQYGCF6MDOHRWQH \
  | 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: 81f8085ad1f6188860c22f98371e3681c8af966680a6229e82f73d3e5870b624

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "18b3bce79e2d480bd530704f45953ff96c85550944739841b09281991d52a1ed",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "quant-ph",
    "submitted_at": "2001-04-04T09:13:15Z",
    "title_canon_sha256": "98e79fd6d620aeb258c3ea53fd8619bd7dffaa37c5513c7db3729863c57918db"
  },
  "schema_version": "1.0",
  "source": {
    "id": "quant-ph/0104021",
    "kind": "arxiv",
    "version": 2
  }
}