Pith Number

pith:QHB4RJTG

pith:2009:QHB4RJTGK5LFIEHKQELJNUKBWV

not attested not anchored not stored refs pending

Simplified Quantum Process Tomography

I. A. Walmsley, J. Nunn, M. P. A. Branderhorst, R. L. Kosut

arxiv:0910.4609 v2 · 2009-10-24 · 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{QHB4RJTGK5LFIEHKQELJNUKBWV}

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	2026-05-18T02:11:11.996188Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

81c3c8a66657565410ea811696d141b57850d9ba6e02d3debaef85d5097cc2fb

Aliases

arxiv: 0910.4609 · arxiv_version: 0910.4609v2 · doi: 10.48550/arxiv.0910.4609 · pith_short_12: QHB4RJTGK5LF · pith_short_16: QHB4RJTGK5LFIEHK · pith_short_8: QHB4RJTG

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/QHB4RJTGK5LFIEHKQELJNUKBWV \
  | 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: 81c3c8a66657565410ea811696d141b57850d9ba6e02d3debaef85d5097cc2fb

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "57dd9f74570c06000fe7520a29ffdb3f5a4a117110e6f42e85eca5ded4cfa99a",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "quant-ph",
    "submitted_at": "2009-10-24T00:37:36Z",
    "title_canon_sha256": "243330913b32a3f917e53553555b7893d38db4f3b49661e2350ac07b1a6bc619"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0910.4609",
    "kind": "arxiv",
    "version": 2
  }
}