Pith Number

pith:U7SUYSRP

pith:2017:U7SUYSRP7WLO4APHHMHCNQ4ZXJ

not attested not anchored not stored refs pending

Unconditional violation of the shot noise limit in photonic quantum metrology

Geoff J. Pryde, Helen M. Chrzanowski, Lynden K. Shalm, Morgan M. Weston, Sae Woo Nam, Sergei Slussarenko, Varun B. Verma

arxiv:1707.08977 v2 · 2017-07-27 · 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{U7SUYSRP7WLO4APHHMHCNQ4ZXJ}

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	2026-05-18T00:12:38.591604Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

a7e54c4a2ffd96ee01e73b0e26c399ba5e110f3a1e6d0f8b9d25656d98f15f38

Aliases

arxiv: 1707.08977 · arxiv_version: 1707.08977v2 · doi: 10.48550/arxiv.1707.08977 · pith_short_12: U7SUYSRP7WLO · pith_short_16: U7SUYSRP7WLO4APH · pith_short_8: U7SUYSRP

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/U7SUYSRP7WLO4APHHMHCNQ4ZXJ \
  | 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: a7e54c4a2ffd96ee01e73b0e26c399ba5e110f3a1e6d0f8b9d25656d98f15f38

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "2c30c6dfbfe513907cd7d8cbc4322725c51f0b3f25f4df23b12fdc8d986896eb",
    "cross_cats_sorted": [
      "physics.optics"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "quant-ph",
    "submitted_at": "2017-07-27T18:01:35Z",
    "title_canon_sha256": "7bb16adba22f84e07f1f3030cf8c5d67a4648d8fb75c82655a40b76943f89b13"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1707.08977",
    "kind": "arxiv",
    "version": 2
  }
}