Pith Number

pith:QU7Q3TBM

pith:2009:QU7Q3TBMMFEC7BDN62KWKF6SNW

not attested not anchored not stored refs pending

Concurrence and Entanglement Entropy of Stochastic 1-Qubit Maps

Armin Uhlmann, Meik Hellmund

arxiv:0903.1340 v1 · 2009-03-07 · 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{QU7Q3TBMMFEC7BDN62KWKF6SNW}

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	2026-05-18T03:24:42.337416Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

853f0dcc2c61482f846df6956517d26d9a5cc4d9a74097d8811f4fd229ebc910

Aliases

arxiv: 0903.1340 · arxiv_version: 0903.1340v1 · doi: 10.48550/arxiv.0903.1340 · pith_short_12: QU7Q3TBMMFEC · pith_short_16: QU7Q3TBMMFEC7BDN · pith_short_8: QU7Q3TBM

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/QU7Q3TBMMFEC7BDN62KWKF6SNW \
  | 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: 853f0dcc2c61482f846df6956517d26d9a5cc4d9a74097d8811f4fd229ebc910

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "a01ef110bc5c437e06351b9b4ab98050d129d6b80b4830d3c04385f75cfe96bf",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "quant-ph",
    "submitted_at": "2009-03-07T11:59:35Z",
    "title_canon_sha256": "bf102eeffddb0030ca5e1e386ee97e4ca24aaff88455aa6a167c04d69b6f3215"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0903.1340",
    "kind": "arxiv",
    "version": 1
  }
}