Pith Number

pith:XBAH6Z57

pith:1998:XBAH6Z57K6WJBEXZKSVY63BZWR

not attested not anchored not stored refs pending

Optical Tachyons in Parametric Amplifiers: How Fast Can Quantum Information Travel?

A. E. Kozhekin, A. G. Kofman (Weizmann Inst. of Science, G. Kurizki, Israel), M. Blaauboer (Vrije Universiteit, the Netherlands)

arxiv:quant-ph/9805040 v1 · 1998-05-14 · quant-ph · physics.optics

Open paper page JSON Open Graph Bundle Merged state Verified badge What is a Pith Number?

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{XBAH6Z57K6WJBEXZKSVY63BZWR}

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	2026-05-18T04:24:14.416515Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

b8407f67bf57ac9092f954ab8f6c39b468a2fe943015e22eb69b5f467c05a5e9

Aliases

arxiv: quant-ph/9805040 · arxiv_version: quant-ph/9805040v1 · doi: 10.48550/arxiv.quant-ph/9805040 · pith_short_12: XBAH6Z57K6WJ · pith_short_16: XBAH6Z57K6WJBEXZ · pith_short_8: XBAH6Z57

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/XBAH6Z57K6WJBEXZKSVY63BZWR \
  | 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: b8407f67bf57ac9092f954ab8f6c39b468a2fe943015e22eb69b5f467c05a5e9

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "617cee8cd5eac6c1c7d7fd32b815b816d02891d47e3b89895b4852562ac186bc",
    "cross_cats_sorted": [
      "physics.optics"
    ],
    "license": "",
    "primary_cat": "quant-ph",
    "submitted_at": "1998-05-14T09:03:30Z",
    "title_canon_sha256": "bc9b193d7f075df80f50118eb240c90042586c81535fa1338b3306453db2eba3"
  },
  "schema_version": "1.0",
  "source": {
    "id": "quant-ph/9805040",
    "kind": "arxiv",
    "version": 1
  }
}