Pith Number

pith:DTZHBR2O

pith:2013:DTZHBR2O2O6NTXSF6A3BR4I4ZE

not attested not anchored not stored refs pending

Computing quantum discord is NP-complete

Yichen Huang

arxiv:1305.5941 v3 · 2013-05-25 · quant-ph · cs.CC

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{DTZHBR2O2O6NTXSF6A3BR4I4ZE}

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	2026-05-18T02:55:20.618804Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

1cf270c74ed3bcd9de45f03618f11cc927260adc32d56694218d5e24e690f4b6

Aliases

arxiv: 1305.5941 · arxiv_version: 1305.5941v3 · doi: 10.48550/arxiv.1305.5941 · pith_short_12: DTZHBR2O2O6N · pith_short_16: DTZHBR2O2O6NTXSF · pith_short_8: DTZHBR2O

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/DTZHBR2O2O6NTXSF6A3BR4I4ZE \
  | 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: 1cf270c74ed3bcd9de45f03618f11cc927260adc32d56694218d5e24e690f4b6

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "0d2031f10aab9fa3d614e8889686dd73e2ee035c1eb9be5a15b2ddcb50e21083",
    "cross_cats_sorted": [
      "cs.CC"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "quant-ph",
    "submitted_at": "2013-05-25T15:54:58Z",
    "title_canon_sha256": "dff65b78576ecdb4f325f4c710de8a856485f087b6fdead78fe9f474edb805f2"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1305.5941",
    "kind": "arxiv",
    "version": 3
  }
}