Pith Number

pith:23WB2MAR

pith:2019:23WB2MARD4D4IBPKCBS2SQB5MG

not attested not anchored not stored refs pending

Beating the fundamental rate-distance limit in a proof-of-principle quantum key distribution system

Chao-Han Cui, De-Yong He, Feng-yu Lu, Guang-Can Guo, Shuang Wang, Wei Chen, Zheng-Fu Han, Zheng Zhou, Zhen-Qiang Yin

arxiv:1902.06884 v1 · 2019-02-19 · 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{23WB2MARD4D4IBPKCBS2SQB5MG}

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	2026-05-17T23:43:36.973446Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

d6ec1d30111f07c405ea1065a9403d619120cab25a70c08dd7dad77c68b27093

Aliases

arxiv: 1902.06884 · arxiv_version: 1902.06884v1 · doi: 10.48550/arxiv.1902.06884 · pith_short_12: 23WB2MARD4D4 · pith_short_16: 23WB2MARD4D4IBPK · pith_short_8: 23WB2MAR

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/23WB2MARD4D4IBPKCBS2SQB5MG \
  | 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: d6ec1d30111f07c405ea1065a9403d619120cab25a70c08dd7dad77c68b27093

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "8a1488a3775452e621ecca13840b5d36d42f50bcd1bcb82eb3a46ee66fc996f1",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "quant-ph",
    "submitted_at": "2019-02-19T04:02:48Z",
    "title_canon_sha256": "5a40977fc205d6f3cc248e44bf1497da2340b54e6f4581a1162d47d03f8d5b51"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1902.06884",
    "kind": "arxiv",
    "version": 1
  }
}