Pith Number

pith:47GOKS2N

pith:2002:47GOKS2NZLGJD4YHXNTRU3ZX6D

not attested not anchored not stored refs pending

A New Strategy of Quantum-State Estimation for Achieving the Cramer-Rao Bound

Kazuo Nakamura, Keiji Matsumoto, Koji Usami, Yoshihiro Nambu, Yoshiyuki Tsuda

arxiv:quant-ph/0209074 v1 · 2002-09-11 · 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{47GOKS2NZLGJD4YHXNTRU3ZX6D}

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	2026-05-18T03:24:20.270766Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

e7cce54b4dcacc91f307bb671a6f37f0c0eed3dc61e1e8409aa851b06bfbcba8

Aliases

arxiv: quant-ph/0209074 · arxiv_version: quant-ph/0209074v1 · doi: 10.48550/arxiv.quant-ph/0209074 · pith_short_12: 47GOKS2NZLGJ · pith_short_16: 47GOKS2NZLGJD4YH · pith_short_8: 47GOKS2N

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/47GOKS2NZLGJD4YHXNTRU3ZX6D \
  | 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: e7cce54b4dcacc91f307bb671a6f37f0c0eed3dc61e1e8409aa851b06bfbcba8

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "bb1f85bc8ab8507e544773a9f62b4c5beddbb215ea1c59b035cc484bedfe6d99",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "quant-ph",
    "submitted_at": "2002-09-11T08:51:17Z",
    "title_canon_sha256": "412f501a51f9f54a472ca5d96603f4e090931fddbef044b671883cd74912f4f5"
  },
  "schema_version": "1.0",
  "source": {
    "id": "quant-ph/0209074",
    "kind": "arxiv",
    "version": 1
  }
}