Pith Number

pith:VWHPUSHC

pith:2026:VWHPUSHCD27LAKSRLLMCH7YBV3

not attested not anchored not stored refs pending

Entangled Telecom Photon Generation using Twisted Van der Waals Crystals

Andrea Balocchi, Delphine Lagarde, Deng Hu, Di Lin, Gang Wang, Hanting Li, Konstantinos Mourzidis, Liu Yang, Nidhin Prasannan, Pierre Renucci, Vishwas Jindal, Wenchen Yang, Xavier Marie, Zhiwei Wang

A 90-degree twist in NbOBr2 van der Waals crystals produces polarization-entangled telecom photons with over 95% fidelity.

arxiv:2605.14592 v1 · 2026-05-14 · physics.optics · cond-mat.other

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\usepackage{pith}
\pithnumber{VWHPUSHCD27LAKSRLLMCH7YBV3}

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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.

Claims

C1strongest claim

We experimentally obtain entanglement fidelities exceeding 95% for Bell states, along with a high coincidence-to-accidental ratio of ∼335, and a brightness approximately one order of magnitude higher than recently reported telecom sources based on transition metal dichalcogenide (TMD) 2D materials.

C2weakest assumption

The 90° twisted stacking specifically induces the quantum interference responsible for polarization entanglement, rather than arising from other material properties, alignment artifacts, or unaccounted experimental factors.

C3one line summary

Twisted NbOBr2 van der Waals crystals generate polarization-entangled telecom photons with >95% Bell-state fidelity via SPDC, showing higher brightness than prior TMD-based sources.

Formal links

2 machine-checked theorem links

Receipt and verification

First computed	2026-05-17T23:39:05.232889Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

ad8efa48e21ebeb02a515ad823ff01aec3ebcce6f59e78941f1ee0abed8b85cd

Aliases

arxiv: 2605.14592 · arxiv_version: 2605.14592v1 · doi: 10.48550/arxiv.2605.14592 · pith_short_12: VWHPUSHCD27L · pith_short_16: VWHPUSHCD27LAKSR · pith_short_8: VWHPUSHC

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/VWHPUSHCD27LAKSRLLMCH7YBV3 \
  | 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: ad8efa48e21ebeb02a515ad823ff01aec3ebcce6f59e78941f1ee0abed8b85cd

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "b59af4e7c3f6bfe4f8ea811514c0877fc421c444c01fba8d1f38442723d3cbfd",
    "cross_cats_sorted": [
      "cond-mat.other"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "physics.optics",
    "submitted_at": "2026-05-14T09:02:13Z",
    "title_canon_sha256": "d6929db6b7166dfd87bd9ba3b4d343777289de4fbfe36c18eb328f2568efd56e"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2605.14592",
    "kind": "arxiv",
    "version": 1
  }
}