Claim

At 370 km, all tested twin-field QKD links surpassed the PLOB repeaterless bound, with key-rate improvements ranging from 51.5% to 251.4%.

Type COMPARATIVE · truth-evaluable: yes · status at snapshot: ACTIVE · created seq 21858

a comma-separated series may list several propositions

Referenced 123 times: checked 2, looked up by assistants 0, viewed 77, shared 44. A count of attention, not evidence.

Topics

Physics · 1efd24fe Security · 1efd24fe

Assessment

Supported

Score: 0.9781 under ledger-default@0.3.0 at snapshot 27745

1 of 4 review checks done · 1 counted

2 independent evidence lineages · review checks 1 of 4 · stability HIGH

Main unresolved issue: 3 counted evidence items have no independence review; repeats of one origin may be counted as several coverage:8fa94ba2-50a6-8f8f-bb4d-cc61846bd5cb

Not yet independently audited.Evidence reviewed so far supports this claim, but only 1 of 4 review checks has been done.A quoted passage from nature.com was not found on the page when Galedra fetched it.

Why?

Strongest counted support: The primary study reports bound exceedance across all tested links and the key-rate improvement range. weight 2.000000 evidence

Suppressed as dependent: The excerpt directly reports all 20 links surpassing the PLOB bound at 370 km and 51.5%–251.4% key-rate improvement.

Review gaps: qualifiers reviewed, opposing search done, independence reviewed

What would most change this: One independent, direct measurement that contradicts this claim would move it from Supported to Supported.

Hide calculation

0.9781 under ledger-default@0.3.0 at snapshot 27745 · state Supported · Review checks: 1 of 4 · stability HIGH · 3 sources, 2 independent lineages

Model ledger-default@0.3.0 (the default model, not the answer) · snapshot 27745 · trace sha256:e2bc2c0e4c935eea24ebe07e17b2ebbdb7915bc31c05de7e6a5f0be925e90586

Last changed at entry seq 24875; nothing logged since has borne on this claim.

How the number was reached

Each counted link is weighed by multiplying the factors the model declares; a factor it does not declare is not shown. Every factor name below links to what that number means.

Link	Working	Weight	Counted as
5477ad8c support	relevance DIRECT 2.0 × observation DIRECT_TEXT 0.9 × interpretation 0 steps, 1 − 0.15 × 0 1.000000 × authenticity UNVERIFIED 1.0 × extraction UNVERIFIED 1.0 × provenance INDEPENDENT 1.0 × edition NAMED_OR_UNRELATED 1	1.800000	0.000000 (dependent strongest only, kept f91c62b6)
f0bfbbb4 support	relevance DIRECT 2.0 × observation DIRECT_TEXT 0.9 × interpretation 0 steps, 1 − 0.15 × 0 1.000000 × authenticity UNVERIFIED 1.0 × extraction UNVERIFIED 1.0 × provenance INDEPENDENT 1.0 × edition NAMED_OR_UNRELATED 1	1.800000	1.800000
f91c62b6 support	relevance DIRECT 2.0 × observation MEASUREMENT 1.0 × interpretation 0 steps, 1 − 0.15 × 0 1.000000 × authenticity UNVERIFIED 1.0 × extraction UNVERIFIED 1.0 × provenance INDEPENDENT 1.0 × edition NAMED_OR_UNRELATED 1	2.000000	2.000000

prior 0.50 → log-odds 0.000000 + 3.800000 (the counted weights) = 3.800000 → probability 0.9781

Under neighbouring settings of the same model: 0.9346 to 0.9929, a spread of 0.0583.

Half-even rounding, six places for weights and four for the probability. The same inputs under the same model reproduce this exactly; that is what the trace hash above is for. How a score is worked out explains every factor, why it is there, and what the model sets it to.

Your view

Registered views

Nobody has registered a view yet.

Registered views are personal belief, not evidence: they never change Galedra's assessment. Affiliations are self-declared and shown only for groups of 5 or more.

Checked as part of

Statements this claim was broken out of. The claim is scored on its own; a statement's reading only counts its claims.

“At 370 km, all tested twin-field QKD links surpassed the PLOB repeaterless bound, with key-rate improvements ranging from 51.5% to 251.4%.” · 1 claim · 29 September 2026
“A 2026 Nature study demonstrated a scalable integrated-photonics twin-field quantum-key-distribution network.” · 3 claims · 29 September 2026

Evidence for

The primary study reports bound exceedance across all tested links and the key-rate improvement range.

From Large-scale quantum communication networks with integrated photonics Read 2026-09-29 Relevance DIRECT Steps 0 Counted

Exact key-rate comparison.
The article’s results section repeats bound exceedance and the 51.5%–251.4% improvement range.

From Large-scale quantum communication networks with integrated photonics Read 2026-09-29 Relevance DIRECT Steps 0 Counted

Additional exact primary key-rate passage.
The excerpt directly reports all 20 links surpassing the PLOB bound at 370 km and 51.5%–251.4% key-rate improvement.

From Large-scale quantum communication networks with integrated photonics Read 2026-09-29 Relevance DIRECT Steps 0 Counted

Evidence against

None.

Qualifications

None.

Suppressed as dependent

Evidence	Group	Kept instead
b836fb08		f91c62b6

Inferences

Concluded from

None.

Used as a premise in

None.

An inference is interpretation, not evidence: it never changes the assessment of its conclusion. Each premise is a claim with its own evidence.

Threads

None. Threads are for disagreements about how a determination was made — a statement whose figures are not in the passage it rests on, two sources that may share an origin. Something about the world belongs in the evidence above.

Claim edges

None. Edges are stored and displayed; v0.1 does not propagate probability across them.

Review checklist

Review checks: 1 of 4

1 check by this claim's own author, alongside the independent review above. 1 EVIDENCE VERIFICATION. A check by the person who recorded a claim does not raise its review coverage.

Check	Done	By
qualifiers reviewed	no
opposing search done	no
independence reviewed	no
primary source reviewed	yes	5477ad8c, f0bfbbb4, f91c62b6

Summary

Supported. The main support is: The article’s results section repeats bound exceedance and the 51.5%–251.4% improvement range. e530ef46

1 further item repeats the same origin and is not independent evidence. b836fb08

Review checks: 1 of 4. coverage:8fa94ba2-50a6-8f8f-bb4d-cc61846bd5cb

Generated by stub-v0.1; every sentence cites graph ids.

Contribution history

seq	event	detail
21858	APPENDED
21859	ACCEPT	AUTOMATIC_AFTER_VALIDATION
21872	LINK_EVIDENCE	by 1efd24fe (accepted)
21990	LINK_EVIDENCE	by 1efd24fe (accepted)
24874	TASK_RESULT	by 1efd24fe (accepted)

Score trace

{
  "claim": "8fa94ba2-50a6-8f8f-bb4d-cc61846bd5cb",
  "links": [
    {
      "kept": "e5e84225-98a1-85b9-9794-bdaef91c62b6",
      "link": "b88d75fd-2a8d-8d58-944a-107a5477ad8c",
      "group": null,
      "reason": "dependent_strongest_only",
      "edition": "NAMED_OR_UNRELATED",
      "evidence": "b14d40c8-e407-8e89-a613-2aa6b836fb08",
      "direction": "SUPPORT",
      "magnitude": "1.800000",
      "relevance": "DIRECT",
      "extraction": "UNVERIFIED",
      "provenance": "INDEPENDENT",
      "observation": "DIRECT_TEXT",
      "source_type": "PRIMARY_TEXT",
      "authenticity": "UNVERIFIED",
      "audit_confirmed": false,
      "effective_weight": "0.000000",
      "interpretive_steps": 0
    },
    {
      "link": "d27ede65-d825-801c-9907-6b6ef0bfbbb4",
      "group": null,
      "edition": "NAMED_OR_UNRELATED",
      "evidence": "f72f4de2-aa88-89d1-8035-96a9e530ef46",
      "direction": "SUPPORT",
      "magnitude": "1.800000",
      "relevance": "DIRECT",
      "extraction": "UNVERIFIED",
      "provenance": "INDEPENDENT",
      "observation": "DIRECT_TEXT",
      "source_type": "PRIMARY_TEXT",
      "authenticity": "UNVERIFIED",
      "audit_confirmed": false,
      "effective_weight": "1.800000",
      "interpretive_steps": 0
    },
    {
      "link": "e5e84225-98a1-85b9-9794-bdaef91c62b6",
      "group": null,
      "edition": "NAMED_OR_UNRELATED",
      "evidence": "15d9ca47-5b46-8571-9c9d-1c630365e413",
      "direction": "SUPPORT",
      "magnitude": "2.000000",
      "relevance": "DIRECT",
      "extraction": "UNVERIFIED",
      "provenance": "INDEPENDENT",
      "observation": "MEASUREMENT",
      "source_type": "PRIMARY_TEXT",
      "authenticity": "UNVERIFIED",
      "audit_confirmed": false,
      "effective_weight": "2.000000",
      "interpretive_steps": 0
    }
  ],
  "model": "ledger-default@0.3.0",
  "prior": "0.50",
  "variants": {
    "spread": "0.0583",
    "permissive": "0.9929",
    "conservative": "0.9346"
  },
  "code_hash": "sha256:c61a6fdf35a754a0d7e958df149036a083c0eaeb7d2d2e52704ec32b0c36def7",
  "contested": false,
  "stability": "HIGH",
  "claim_type": "COMPARATIVE",
  "config_hash": "sha256:86768038080b8ab5233f1e4b7aba10af05b5bb44caa432095150b90e81209809",
  "probability": "0.9781",
  "provisional": true,
  "evidence_sum": "3.800000",
  "snapshot_seq": 24875,
  "prior_log_odds": "0.000000",
  "support_groups": 2,
  "model_dependent": false,
  "review_coverage": "0.25",
  "truth_evaluable": true,
  "assessment_state": "SUPPORTED",
  "review_checklist": {
    "qualifiers_reviewed": {
      "by": [],
      "ok": false
    },
    "opposing_search_done": {
      "by": [],
      "ok": false
    },
    "independence_reviewed": {
      "by": [],
      "ok": false
    },
    "primary_source_reviewed": {
      "by": [
        "b88d75fd-2a8d-8d58-944a-107a5477ad8c",
        "d27ede65-d825-801c-9907-6b6ef0bfbbb4",
        "e5e84225-98a1-85b9-9794-bdaef91c62b6"
      ],
      "ok": true
    }
  },
  "contradict_groups": 0,
  "rounding_boundary": false,
  "posterior_log_odds": "3.800000",
  "not_applicable_reason": null,
  "independence_unreviewed": 3
}