Pith Number

pith:YHCY7DDA

pith:2011:YHCY7DDAKGSG7I4GBXTUMNEB4Z

not attested not anchored not stored refs pending

Improving Quantum Clocks via Semidefinite Programming

Emanuel Knill, Michael Mullan

arxiv:1107.5347 v1 · 2011-07-26 · 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{YHCY7DDAKGSG7I4GBXTUMNEB4Z}

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	2026-05-18T04:16:52.228756Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

c1c58f8c6051a46fa3860de7463481e66653b313f42e624964a7841e8258eae3

Aliases

arxiv: 1107.5347 · arxiv_version: 1107.5347v1 · doi: 10.48550/arxiv.1107.5347 · pith_short_12: YHCY7DDAKGSG · pith_short_16: YHCY7DDAKGSG7I4G · pith_short_8: YHCY7DDA

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/YHCY7DDAKGSG7I4GBXTUMNEB4Z \
  | 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: c1c58f8c6051a46fa3860de7463481e66653b313f42e624964a7841e8258eae3

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "33720c2c337b224569bf735275547e0be615233fa771f3f0527e65147f38c6c6",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "quant-ph",
    "submitted_at": "2011-07-26T22:22:54Z",
    "title_canon_sha256": "68fafaf057bb8e9ebed84bf66e3363d8ccfc094eb6d8c764cee5cefad1db8ced"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1107.5347",
    "kind": "arxiv",
    "version": 1
  }
}