Pith Number

pith:P7THU5UZ

pith:2009:P7THU5UZN7KG6BDWTSOOU4QVOM

not attested not anchored not stored refs pending

Entanglement Sudden Death as an Indicator of Fidelity in a Four-Qubit Cluster State

Yaakov S. Weinstein

arxiv:0902.2697 v1 · 2009-02-16 · 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{P7THU5UZN7KG6BDWTSOOU4QVOM}

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	2026-05-18T02:14:47.622667Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

7fe67a76996fd46f04769c9cea7215731df100700e84593ec62bc7f849b60d55

Aliases

arxiv: 0902.2697 · arxiv_version: 0902.2697v1 · doi: 10.48550/arxiv.0902.2697 · pith_short_12: P7THU5UZN7KG · pith_short_16: P7THU5UZN7KG6BDW · pith_short_8: P7THU5UZ

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/P7THU5UZN7KG6BDWTSOOU4QVOM \
  | 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: 7fe67a76996fd46f04769c9cea7215731df100700e84593ec62bc7f849b60d55

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "45af7deb4dc7c6fede63d9ee876786ea602b1ff579aeac8982941c4dd5901393",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "quant-ph",
    "submitted_at": "2009-02-16T14:14:14Z",
    "title_canon_sha256": "7dcaed71424a4cffec27cc1da0702512c5e31173cbdde2ff49b9287305358d5f"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0902.2697",
    "kind": "arxiv",
    "version": 1
  }
}