Pith Number

pith:L33AIUYT

pith:2026:L33AIUYTYWOFZ7NUGPUW5QKETN

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Entanglement distribution: To herald or not to herald

Clark Embleton, Jeffrey H. Shapiro, J. Gabriel Richardson

Unheralded operation exceeds the entanglement distribution rates of both ZALM and signal-path erasure systems for heralding efficiencies of 90% or lower when using equal numbers of spectral islands and quantum memories per pump pulse.

arxiv:2603.06423 v2 · 2026-03-06 · quant-ph

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\pithnumber{L33AIUYTYWOFZ7NUGPUW5QKETN}

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3 Author claim open · sign in to claim

4 Citations open

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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

For 90% or lower heralding efficiencies, ZALM's per-pump-pulse entanglement distribution rate exceeds that of the signal-path erasure source, and both rates are inferior to unheralded operation's when all three systems employ N_I spectral islands and allocate N_M = N_I quantum memories to each pump pulse.

C2weakest assumption

The assumption that N_M equals N_I quantum memories can be fairly allocated to each pump pulse across all systems and that heralding efficiency can be treated as an independent parameter without affecting other losses or timing constraints.

C3one line summary

Unheralded Sagnac SPDC sources achieve higher per-pump-pulse entanglement distribution rates than heralded ZALM or signal-path erasure systems for heralding efficiencies at or below 90% when using equal numbers of spectral islands and quantum memories.

References

50 extracted · 50 resolved · 0 Pith anchors

[1] j1D4sRFsv0hs/QeGiIu75S8yLCE=

[2] New high-intensity source of polarization-entangled photon pairs, 1995

[3] Ultrabright source of polarization-entangled photons, 1999

[4] Bell-state preparation using pulsed nondegenerate two-photon entanglement, 2001

[5] High-efficiency entangled photon pair collection in type-II parametric fluorescence, 2001

Receipt and verification

First computed	2026-05-18T02:44:30.882970Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

5ef6045313c59c5cfdb433e96ec1449b620c8405058d76fd3a4f136e206fa56f

Aliases

arxiv: 2603.06423 · arxiv_version: 2603.06423v2 · doi: 10.48550/arxiv.2603.06423 · pith_short_12: L33AIUYTYWOF · pith_short_16: L33AIUYTYWOFZ7NU · pith_short_8: L33AIUYT

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/L33AIUYTYWOFZ7NUGPUW5QKETN \
  | 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: 5ef6045313c59c5cfdb433e96ec1449b620c8405058d76fd3a4f136e206fa56f

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "876953187d68b1d80973fd23ec81275e240c6620468e62676a5583fc1eafbb28",
    "cross_cats_sorted": [],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "primary_cat": "quant-ph",
    "submitted_at": "2026-03-06T15:59:23Z",
    "title_canon_sha256": "b96fd971b4873f501559d3b2840d0734e7b075e74e2b46f133dcacaf37d6f5d7"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2603.06423",
    "kind": "arxiv",
    "version": 2
  }
}