Pith Number

pith:XIKUQMUE

pith:2022:XIKUQMUE4JFC42J3EO2MTD6ROB

not attested not anchored not stored refs pending

Efficient factored gradient descent algorithm for quantum state tomography

Jie Chen, Lijun Liu, Li Li, Shuming Cheng, Yong Wang

arxiv:2207.05341 v4 · 2022-07-12 · quant-ph · physics.data-an

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{XIKUQMUE4JFC42J3EO2MTD6ROB}

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	2026-07-05T08:40:51.249178Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

ba15483284e24a2e693b23b4c98fd1707ac65c543a26dca52c8ecad9d379f071

Aliases

arxiv: 2207.05341 · arxiv_version: 2207.05341v4 · doi: 10.48550/arxiv.2207.05341 · pith_short_12: XIKUQMUE4JFC · pith_short_16: XIKUQMUE4JFC42J3 · pith_short_8: XIKUQMUE

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/XIKUQMUE4JFC42J3EO2MTD6ROB \
  | 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: ba15483284e24a2e693b23b4c98fd1707ac65c543a26dca52c8ecad9d379f071

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "58a71f875e6c7e409fa70e26413168823a814301935ad8bd32553659e9e317b8",
    "cross_cats_sorted": [
      "physics.data-an"
    ],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "primary_cat": "quant-ph",
    "submitted_at": "2022-07-12T06:45:35Z",
    "title_canon_sha256": "29b175f7600f397d61300f50f2b9562540091e3e9430640290b04c9ef2612019"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2207.05341",
    "kind": "arxiv",
    "version": 4
  }
}