{"paper":{"title":"No-cloning with unitary scaling","license":"http://creativecommons.org/licenses/by/4.0/","headline":"It is impossible to produce a U-copy of an arbitrary unknown quantum pure state using unitary evolution.","cross_cats":[],"primary_cat":"quant-ph","authors_text":"Dafa Li","submitted_at":"2026-04-24T19:03:39Z","abstract_excerpt":"It is known that the classical information like strings of bits can be copied. In 1982, Wootters and Zurek proposed the quantum no-cloning principle. No-cloning principle says that it is impossible to make an identical copy of an arbitrary unknown quantum pure state by using unitary evolution. In this paper, we call U $|\\psi>$, where U is any unitary operator, a U-copy of the state $|{\\psi}>$ and show it is impossible to make a U-copy of an arbitrary unknown quantum pure state by using unitary evolution."},"claims":{"count":4,"items":[{"kind":"strongest_claim","text":"we call U |ψ>, where U is any unitary operator, a U-copy of the state |ψ> and show it is impossible to make a U-copy of an arbitrary unknown quantum pure state by using unitary evolution.","source":"verdict.strongest_claim","status":"machine_extracted","claim_id":"C1","attestation":"unclaimed"},{"kind":"weakest_assumption","text":"The definition of a U-copy as simply U|ψ> for a fixed unitary U independent of the unknown state |ψ>, combined with the restriction to unitary evolution on the composite system, as introduced in the abstract.","source":"verdict.weakest_assumption","status":"machine_extracted","claim_id":"C2","attestation":"unclaimed"},{"kind":"one_line_summary","text":"It is impossible to produce a U-copy of an arbitrary unknown quantum pure state using unitary evolution.","source":"verdict.one_line_summary","status":"machine_extracted","claim_id":"C3","attestation":"unclaimed"},{"kind":"headline","text":"It is impossible to produce a U-copy of an arbitrary unknown quantum pure state using unitary evolution.","source":"verdict.pith_extraction.headline","status":"machine_extracted","claim_id":"C4","attestation":"unclaimed"}],"snapshot_sha256":"1b4b6ebefe811e883569080353cef9c3c6ebc42b134011decd1be7d5b24305c3"},"source":{"id":"2604.22960","kind":"arxiv","version":2},"verdict":{"id":"5e0959de-1f4b-4844-bc81-55f80894e596","model_set":{"reader":"grok-4.3"},"created_at":"2026-05-19T16:31:54.776867Z","strongest_claim":"we call U |ψ>, where U is any unitary operator, a U-copy of the state |ψ> and show it is impossible to make a U-copy of an arbitrary unknown quantum pure state by using unitary evolution.","one_line_summary":"It is impossible to produce a U-copy of an arbitrary unknown quantum pure state using unitary evolution.","pipeline_version":"pith-pipeline@v0.9.0","weakest_assumption":"The definition of a U-copy as simply U|ψ> for a fixed unitary U independent of the unknown state |ψ>, combined with the restriction to unitary evolution on the composite system, as introduced in the abstract.","pith_extraction_headline":"It is impossible to produce a U-copy of an arbitrary unknown quantum pure state using unitary evolution."},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2604.22960/integrity.json","findings":[],"available":true,"detectors_run":[{"name":"doi_compliance","ran_at":"2026-05-19T23:35:28.483838Z","status":"completed","version":"1.0.0","findings_count":0}],"snapshot_sha256":"71d763d218a2f59c229592be984ffcae0ad6df024cd2deb78f912e220797903c"},"references":{"count":8,"sample":[{"doi":"","year":1982,"title":"W. 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