Pith Number

pith:OTBJ5PFD

pith:2021:OTBJ5PFDXEDBIWKO3CNFIRBYB6

not attested not anchored not stored refs pending

Observation of a symmetry-protected topological time crystal with superconducting qubits

Chao Song, Dong-Ling Deng, Feitong Jin, Hang Dong, Hekang Li, H. Wang, Jiachen Chen, Jinfeng Deng, Ke Wang, Pengfei Zhang, Qiujiang Guo, Shibo Xu, Wenhui Ren, Wenjie Jiang, Xuhao Zhu, Xu Zhang, Yu Gao, Zhen Wang

arxiv:2109.05577 v1 · 2021-09-12 · quant-ph · cond-mat.dis-nn · cond-mat.stat-mech · cond-mat.supr-con

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{OTBJ5PFDXEDBIWKO3CNFIRBYB6}

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	2026-07-05T04:43:57.719262Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

74c29ebca3b90614594ed89a5444380fbc9f9bf846b5a322eaae6a1f0a7904fb

Aliases

arxiv: 2109.05577 · arxiv_version: 2109.05577v1 · doi: 10.48550/arxiv.2109.05577 · pith_short_12: OTBJ5PFDXEDB · pith_short_16: OTBJ5PFDXEDBIWKO · pith_short_8: OTBJ5PFD

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/OTBJ5PFDXEDBIWKO3CNFIRBYB6 \
  | 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: 74c29ebca3b90614594ed89a5444380fbc9f9bf846b5a322eaae6a1f0a7904fb

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "c7082bf2d80e5b5cee32219305d03856d3682ae080fc99a5560ef01090a99153",
    "cross_cats_sorted": [
      "cond-mat.dis-nn",
      "cond-mat.stat-mech",
      "cond-mat.supr-con"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "quant-ph",
    "submitted_at": "2021-09-12T18:00:03Z",
    "title_canon_sha256": "e0f5baf1daf2a6170f4ab9c0d3599026b604c170c0b84bf28d71f30ede863f32"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2109.05577",
    "kind": "arxiv",
    "version": 1
  }
}