Pith Number

pith:W3ZGPDHE

pith:2007:W3ZGPDHE5CURFN7YBZL6IBT2KR

not attested not anchored not stored refs pending

On the measurement problem for a two-level quantum system

Alexey A. Kryukov

arxiv:0704.1934 v1 · 2007-04-16 · quant-ph · math-ph · math.MP

Open paper page JSON Open Graph Bundle Merged state Verified badge What is a Pith Number?

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{W3ZGPDHE5CURFN7YBZL6IBT2KR}

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	2026-05-18T02:16:31.802686Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

b6f2678ce4e8a912b7f80e57e4067a545b4763ef129360c411e864e6d362b707

Aliases

arxiv: 0704.1934 · arxiv_version: 0704.1934v1 · doi: 10.48550/arxiv.0704.1934 · pith_short_12: W3ZGPDHE5CUR · pith_short_16: W3ZGPDHE5CURFN7Y · pith_short_8: W3ZGPDHE

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/W3ZGPDHE5CURFN7YBZL6IBT2KR \
  | 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: b6f2678ce4e8a912b7f80e57e4067a545b4763ef129360c411e864e6d362b707

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "13cd27150ae4a6200d14c62b96893816f2bcd72b4e9151404ed4f1ef5840e852",
    "cross_cats_sorted": [
      "math-ph",
      "math.MP"
    ],
    "license": "",
    "primary_cat": "quant-ph",
    "submitted_at": "2007-04-16T04:29:32Z",
    "title_canon_sha256": "edb37b6326f00d6c4558816a24451313625fc90986301e685c167ecb0f6800c7"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0704.1934",
    "kind": "arxiv",
    "version": 1
  }
}