Pith Number

pith:QLAB3V4S

pith:2018:QLAB3V4SJBQKJQTQXQ2553OEO3

not attested not anchored not stored refs pending

Lower and upper bounds on nonunital qubit channel capacities

Sergey N. Filippov

arxiv:1802.00646 v2 · 2018-02-02 · 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{QLAB3V4SJBQKJQTQXQ2553OEO3}

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	2026-05-17T23:50:47.057016Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

82c01dd7924860a4c270bc35deedc476cc538ec00dfe0a75bd306b24bab382da

Aliases

arxiv: 1802.00646 · arxiv_version: 1802.00646v2 · doi: 10.48550/arxiv.1802.00646 · pith_short_12: QLAB3V4SJBQK · pith_short_16: QLAB3V4SJBQKJQTQ · pith_short_8: QLAB3V4S

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/QLAB3V4SJBQKJQTQXQ2553OEO3 \
  | 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: 82c01dd7924860a4c270bc35deedc476cc538ec00dfe0a75bd306b24bab382da

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "da28c16e813bebe2cf34673daa575fffc52406812f9ede9c13ae9e3049fc5d9e",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "quant-ph",
    "submitted_at": "2018-02-02T11:41:13Z",
    "title_canon_sha256": "992ee7c3b7f6d8973010fee918aedc9f4bda5ab1c6cac97ce457331509102cd8"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1802.00646",
    "kind": "arxiv",
    "version": 2
  }
}