Provenance Record

Clear, well-structured Analysis piece (804 words, within the 800-2000 range). Overview/What We Know/Why It Matters/What We Don't Know framing is appropriate; technical depth (cat states, squeezed/trisqueezed/quadsqueezed components, Wigner negativity, bosonic codes) is accurate and not overstated. No sensationalism.

Read all available snapshots in sources/2026-06/oxford-physicists-build-a-new-family-of-schrdingers-cat-states-from-highly-non-classical-components/. source-0.html.gz (University of Oxford Dept of Physics, HTTP 200) is the primary release and confirms: strontium-88 ion, '3 June 2026' publication in Physical Review X, squeezed/trisqueezed/quadsqueezed components, Wigner negativity, 'greater quantum resourcefulness than standard cat states or Fock states', the Saner quote ('sculpt quantum superpositions into almost any shape... rotational symmetries... striking geometric interference patterns'), the Srinivas supervision and 'scratching the surface' quote, and the bosonic-error-correction framing. source-3.html.gz (SciTechDaily, HTTP 200) independently confirms the Srinivas quote verbatim and the 'improved resistance to errors while supporting simpler and more robust error-correction methods' line attributed to it. source-1 (Phys.org) returned HTTP 403 (bot-blocked) with no archive fallback, so the snapshot is empty; as a last resort I WebFetched the live Phys.org URL and confirmed all three Phys.org-attributed phrases verbatim: the qubit/quantum-harmonic-oscillator description, 'The reconstructions revealed interference patterns and regions of Wigner negativity—signatures that the states could not be described as ordinary classical mixtures,' and 'Such states can be more resilient to errors while enabling simpler and more robust error-correction protocols.' source-2 (EurekAlert) returned an AWS WAF challenge page (HTTP 202, no real content); EurekAlert is listed in the sources array but is NOT cited inline anywhere in the body, so no claim depends on it.

Every specific (strontium-88, 3 June 2026 PRX date, Wigner negativity, Fock states, component types, both researcher names and quotes) traces to a fetchable source. The PRX paper page itself is bot-blocked and was correctly NOT placed in the sources array; the DOI (10.1103/k1xk-yt42) appears as plain text only, not as an inline link, so there is no orphan link to a blocked page and no fact rests solely on the paper. No hallucinations detected.

APPROVE. The script defaulted to APPROVE_WITH_CORRECTIONS solely because the Phys.org snapshot was bot-blocked (HTTP 403). That is an archival limitation, not a content defect: all three Phys.org-attributed quotes were confirmed verbatim against the live page, and every fact is independently corroborated by the fetchable Oxford and SciTechDaily releases. There is no recoverable error to document in a corrections note, so the warning does not warrant APPROVE_WITH_CORRECTIONS. The Rule 9 check passes cleanly — the bot-blocked PRX paper is plain-text DOI only and no claim rests on it. Ready for publication.