Pith Number

pith:HUCW5S7A

pith:2012:HUCW5S7AS42GU6OKPVDWQSCGW3

not attested not anchored not stored refs pending

Zero-error classical capacity of qubit channels cannot be superactivated

Jeonghoon Park, Soojoon Lee

arxiv:1205.5851 v1 · 2012-05-26 · 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{HUCW5S7AS42GU6OKPVDWQSCGW3}

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	2026-05-18T03:54:49.818603Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

3d056ecbe097346a79ca7d47684846b6d31cdb7833f5da3dd7c610872602d1a3

Aliases

arxiv: 1205.5851 · arxiv_version: 1205.5851v1 · doi: 10.48550/arxiv.1205.5851 · pith_short_12: HUCW5S7AS42G · pith_short_16: HUCW5S7AS42GU6OK · pith_short_8: HUCW5S7A

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/HUCW5S7AS42GU6OKPVDWQSCGW3 \
  | 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: 3d056ecbe097346a79ca7d47684846b6d31cdb7833f5da3dd7c610872602d1a3

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "b856f5ae965aec84b3fe7ad25ee4c8ddcc37b701c5700d42e80b7d4b920ea30a",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "quant-ph",
    "submitted_at": "2012-05-26T03:50:57Z",
    "title_canon_sha256": "9de284a0008ceaa236fba6bc9e764488cdbe22d8cd91712b8df284d42aff8ece"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1205.5851",
    "kind": "arxiv",
    "version": 1
  }
}