Pith Number

pith:QZRWIFEO

pith:2006:QZRWIFEO4BSHVE2GDODDGMSEWV

not attested not anchored not stored refs pending

An observable entanglement measure for unknown mixed quantum states

Andreas Buchleitner, Florian Mintert

arxiv:quant-ph/0605250 v3 · 2006-05-31 · 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{QZRWIFEO4BSHVE2GDODDGMSEWV}

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	2026-05-18T01:37:56.543466Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

866364148ee0647a93461b86333244b57d8aa1f091b560abffb8f98277e65bc3

Aliases

arxiv: quant-ph/0605250 · arxiv_version: quant-ph/0605250v3 · doi: 10.48550/arxiv.quant-ph/0605250 · pith_short_12: QZRWIFEO4BSH · pith_short_16: QZRWIFEO4BSHVE2G · pith_short_8: QZRWIFEO

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/QZRWIFEO4BSHVE2GDODDGMSEWV \
  | 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: 866364148ee0647a93461b86333244b57d8aa1f091b560abffb8f98277e65bc3

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "43f4d0b845c0ecf4be74b3a4a9f3349001c6d093ef3429e4d426dba963720b48",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "quant-ph",
    "submitted_at": "2006-05-31T02:41:11Z",
    "title_canon_sha256": "fc1841055966c1d8c6a2073ef94cd39c61b36db8ab7a91af6f2be93e7d4882eb"
  },
  "schema_version": "1.0",
  "source": {
    "id": "quant-ph/0605250",
    "kind": "arxiv",
    "version": 3
  }
}