Pith Number

pith:V5TPJ2AE

pith:2004:V5TPJ2AE4W2QULOJ336I2MY52H

not attested not anchored not stored refs pending

Direct measurement of superluminal group velocity and of signal velocity in an optical fiber

Mark Wegmuller, Matthieu Legre, Nicolas Brunner, Nicolas Gisin, Valerio Scarani

arxiv:quant-ph/0407155 v2 · 2004-07-20 · 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{V5TPJ2AE4W2QULOJ336I2MY52H}

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	2026-07-04T16:50:21.304975Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

af66f4e804e5b50a2dc9defc8d331dd1cf137747b3b290f15f4d934c0944e65f

Aliases

arxiv: quant-ph/0407155 · arxiv_version: quant-ph/0407155v2 · doi: 10.48550/arxiv.quant-ph/0407155 · pith_short_12: V5TPJ2AE4W2Q · pith_short_16: V5TPJ2AE4W2QULOJ · pith_short_8: V5TPJ2AE

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/V5TPJ2AE4W2QULOJ336I2MY52H \
  | 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: af66f4e804e5b50a2dc9defc8d331dd1cf137747b3b290f15f4d934c0944e65f

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "6bd212eb72c3484a08c7a7bbd705603f16474eb35c69da84cbf152b54a2c8cf0",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "quant-ph",
    "submitted_at": "2004-07-20T08:48:58Z",
    "title_canon_sha256": "6fc2240ed0709c27aee8c70404a6b3bed74015ae8de5d66271b91ecb21c05731"
  },
  "schema_version": "1.0",
  "source": {
    "id": "quant-ph/0407155",
    "kind": "arxiv",
    "version": 2
  }
}