Pith Number

pith:PCTXKLFL

pith:2019:PCTXKLFLSOTRJK63HL7C2LOV4H

not attested not anchored not stored refs pending

An Improved Algorithm for Quantum Principal Component Analysis

Changpeng Shao

arxiv:1903.03999 v2 · 2019-03-10 · 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{PCTXKLFLSOTRJK63HL7C2LOV4H}

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	2026-05-17T23:49:14.488717Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

78a7752cab93a714abdb3afe2d2dd5e1d2a195b103070e45456e74ced4287d10

Aliases

arxiv: 1903.03999 · arxiv_version: 1903.03999v2 · doi: 10.48550/arxiv.1903.03999 · pith_short_12: PCTXKLFLSOTR · pith_short_16: PCTXKLFLSOTRJK63 · pith_short_8: PCTXKLFL

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/PCTXKLFLSOTRJK63HL7C2LOV4H \
  | 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: 78a7752cab93a714abdb3afe2d2dd5e1d2a195b103070e45456e74ced4287d10

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "b737fc454582bb7773f096130d96b04ce90765f268e96e01b2bb1b0a53025a5b",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "quant-ph",
    "submitted_at": "2019-03-10T14:36:01Z",
    "title_canon_sha256": "4ec6de4ab5d462ad108ca2689e49ae5166b8f565ac3495df15c6c1fc265b208e"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1903.03999",
    "kind": "arxiv",
    "version": 2
  }
}