Pith Number

pith:CQ7GMGEJ

pith:2026:CQ7GMGEJDX3YZCQY4SLAUEV7TU

not attested not anchored not stored refs pending

Long-term Performance Analysis of a Commercial QKD Device Under Real-world Deployment Conditions

Alisson Tezzin, Gustavo M. Uhdre, Oscar Martins, Sabrina Rufo, Vitor G.A. Carneiro

A commercial QKD device maintains visibility above 97 percent and average QBER below 1 percent across months of continuous operation on Brazilian fiber links.

arxiv:2604.16236 v2 · 2026-04-17 · 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{CQ7GMGEJDX3YZCQY4SLAUEV7TU}

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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

Our results demonstrate excellent overall baseline resilience, with the system maintaining visibility above 97% and QBER below 1% on average.

C2weakest assumption

The monitored periods and two specific fiber links are representative of typical operational conditions and that no undisclosed data filtering or post-selection affected the reported averages.

C3one line summary

A commercial QKD device sustained visibility above 97% and QBER below 1% over extended operation on indoor and outdoor fibers in a tropical climate.

Receipt and verification

First computed	2026-05-20T02:05:43.283964Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

143e6618891df78c8a18e4960a12bf9d09a70c52aaaef7ff249c4741f9b7ff37

Aliases

arxiv: 2604.16236 · arxiv_version: 2604.16236v2 · doi: 10.48550/arxiv.2604.16236 · pith_short_12: CQ7GMGEJDX3Y · pith_short_16: CQ7GMGEJDX3YZCQY · pith_short_8: CQ7GMGEJ

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/CQ7GMGEJDX3YZCQY4SLAUEV7TU \
  | 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: 143e6618891df78c8a18e4960a12bf9d09a70c52aaaef7ff249c4741f9b7ff37

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "b7865a0222f918dc31138e6e8cd9fae9da965c6d2f2174f32938b5cbf392d583",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "quant-ph",
    "submitted_at": "2026-04-17T16:54:02Z",
    "title_canon_sha256": "5fa7b63ca99064e06423d3c820154cce3bc38b32f52d6afdfc6b40256f256d81"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2604.16236",
    "kind": "arxiv",
    "version": 2
  }
}