Pith Number

pith:XYV5QWHZ

pith:2018:XYV5QWHZU4I63VSCUTRYV4YFAH

not attested not anchored not stored refs pending

Optimal estimation of entanglement and discord in two-qubit states

Alessio Avella, Enrico Rebufello, Fabrizio Piacentini, Ivano Ruo Berchera, Ivo Pietro Degiovanni, Marco Genovese, Marco Gramegna, Salvatore Virz\'i

arxiv:1810.09331 v1 · 2018-10-22 · 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{XYV5QWHZU4I63VSCUTRYV4YFAH}

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	2026-05-17T23:50:33.672452Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

be2bd858f9a711edd642a4e38af30501e01af43a60370eb8b4e0286da908a37a

Aliases

arxiv: 1810.09331 · arxiv_version: 1810.09331v1 · doi: 10.48550/arxiv.1810.09331 · pith_short_12: XYV5QWHZU4I6 · pith_short_16: XYV5QWHZU4I63VSC · pith_short_8: XYV5QWHZ

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/XYV5QWHZU4I63VSCUTRYV4YFAH \
  | 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: be2bd858f9a711edd642a4e38af30501e01af43a60370eb8b4e0286da908a37a

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "2b21064a5da40f82995dba3e5b057a31a75292f20dcf50302154d6378038b258",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "quant-ph",
    "submitted_at": "2018-10-22T14:52:19Z",
    "title_canon_sha256": "82c798af54a7f66faf54195b81c01acea358ed926092319f23dc90a0585d7f9f"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1810.09331",
    "kind": "arxiv",
    "version": 1
  }
}