Pith Number

pith:3NMFPTGQ

pith:2018:3NMFPTGQPBJ456HATVPWUZPYUV

not attested not anchored not stored refs pending

Sub-Heisenberg-limited nonlinear phase estimation: Parity measurement approaches the quantum Cram\'er-Rao bound

Jian-dong Zhang, Jun-Yan Hu, Long-Zhu Cen, Yuan Zhao, Zi-Jing Zhang

arxiv:1809.04821 v1 · 2018-09-13 · 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{3NMFPTGQPBJ456HATVPWUZPYUV}

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	2026-05-17T23:54:11.013427Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

db5857ccd07853cef8e09d5f6a65f8a57a0429592c98007272147d1d47483364

Aliases

arxiv: 1809.04821 · arxiv_version: 1809.04821v1 · doi: 10.48550/arxiv.1809.04821 · pith_short_12: 3NMFPTGQPBJ4 · pith_short_16: 3NMFPTGQPBJ456HA · pith_short_8: 3NMFPTGQ

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/3NMFPTGQPBJ456HATVPWUZPYUV \
  | 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: db5857ccd07853cef8e09d5f6a65f8a57a0429592c98007272147d1d47483364

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "559c7f362f0237070c7e4bd4c0a9f7137e7bc0ac7ebccd5be7469a904ac1c275",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "quant-ph",
    "submitted_at": "2018-09-13T08:11:34Z",
    "title_canon_sha256": "d54d2e0b1a0ad9a3599ccbfb12e68a1352d1a286e64fc0d748a4b7191df3299b"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1809.04821",
    "kind": "arxiv",
    "version": 1
  }
}