Pith Number

pith:PMTXE7G3

pith:2026:PMTXE7G3PMC5K4ZNIXCRXLTLPZ

not attested not anchored not stored refs pending

Opportunistic QKD: Exploiting Idle Capacity of Classical WDM Systems

Alonso Viladomat Jasso, Janis N\"otzel, Pere Munar Vallespir, Sumit Chaudhary

Opportunistic QKD can repurpose 45-65 percent of unused spectrum in classical WDM systems by borrowing idle channels while protecting classical traffic.

arxiv:2604.12982 v2 · 2026-04-14 · quant-ph

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\usepackage{pith}
\pithnumber{PMTXE7G3PMC5K4ZNIXCRXLTLPZ}

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Record completeness

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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

Monte-Carlo simulations of an 80-channel WDM system with our stochastic traffic model demonstrate that 45-65% of unused spectrum can be repurposed for QKD, depending on the traffic conditions.

C2weakest assumption

The stochastic traffic model with deterministic day-night cycle and fractional Gaussian noise accurately represents real-world classical traffic patterns in WDM systems, enabling reliable estimation of idle capacity.

C3one line summary

Monte-Carlo simulations show that 45-65% of unused spectrum in an 80-channel WDM system can be repurposed for QKD using a stochastic traffic model and key reservoir management with defined reliability metrics.

Receipt and verification

First computed	2026-06-02T02:04:53.049780Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

7b27727cdb7b05d5732d45c51bae6b7e74fe3fdfd04ac911eb2f4996f18ce854

Aliases

arxiv: 2604.12982 · arxiv_version: 2604.12982v2 · doi: 10.48550/arxiv.2604.12982 · pith_short_12: PMTXE7G3PMC5 · pith_short_16: PMTXE7G3PMC5K4ZN · pith_short_8: PMTXE7G3

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/PMTXE7G3PMC5K4ZNIXCRXLTLPZ \
  | 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: 7b27727cdb7b05d5732d45c51bae6b7e74fe3fdfd04ac911eb2f4996f18ce854

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "9e0b2b8031d8cca2480bd3395b5ea339a0bf02b445fca88d2d24e07f5f8a32cb",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "quant-ph",
    "submitted_at": "2026-04-14T17:16:44Z",
    "title_canon_sha256": "8f49d8806dcd33907b52768bdefedbf55baf8e2dcb9de916b676030af096b021"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2604.12982",
    "kind": "arxiv",
    "version": 2
  }
}