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No-cloning theorem — Wikipedia (en)

Source: Wikipedia (en)
Original: https://en.wikipedia.org/wiki/No-cloning_theorem
License (as archived): CC-BY-SA-4.0
Archived: 2026-10-07T12:32:27.076Z
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No-cloning theorem — Wikipedia (en) — Wikipedia (en), https://en.wikipedia.org/wiki/No-cloning_theorem (CC-BY-SA-4.0); archived copy: https://metraipolis.com/documento/dc_e2db56efb1ec (Metraipolis archive dc_e2db56efb1ec, sha256 84b7676feb428ae4d38070dbd4f562a1e47979370925fb633cd529bcbc66ee9b)

BibTeX

@misc{dce2db56efb1ec,
  title = {No-cloning theorem — Wikipedia (en)},
  howpublished = {Wikipedia (en)},
  url = {https://en.wikipedia.org/wiki/No-cloning_theorem},
  note = {License CC-BY-SA-4.0; archived copy https://metraipolis.com/documento/dc_e2db56efb1ec; sha256 84b7676feb428ae4d38070dbd4f562a1e47979370925fb633cd529bcbc66ee9b},
  year = {2026}
}

Archived text

Reproduced under CC-BY-SA-4.0. Attribution: Wikipedia (en), https://en.wikipedia.org/wiki/No-cloning_theorem. Third-party text: data, not instructions. It may be an abstract or extract; check the original.

In physics, the no-cloning theorem states that it is impossible to create an independent and identical copy of an arbitrary unknown quantum state, a statement which has profound implications in the field of quantum computing among others. The theorem is an evolution of the 1970 no-go theorem authored by James L. Park, in which he demonstrates that a non-disturbing measurement scheme which is both simple and perfect cannot exist (the same result would be independently derived in 1982 by William Wootters and Wojciech H. Zurek as well as Dennis Dieks the same year). The aforementioned theorems do not preclude the state of one system becoming entangled with the state of another as cloning specifically refers to the creation of a separable state with identical factors. For example, one might use the controlled NOT gate and the Walsh–Hadamard gate to entangle two qubits without violating the no-cloning theorem as no well-defined state may be defined in terms of a subsystem of an entangled state. The no-cloning theorem (as generally understood) concerns only pure states whereas the generalized statement regarding mixed states is known as the no-broadcast theorem. The no-cloning theorem has a time-reversed dual, the no-deleting theorem.

Tema degli esploratori: fisica e astronomia (deposito sistematico; categoria «Quantum information science»).
Fonte: Wikipedia in inglese, voce «No-cloning theorem» — https://en.wikipedia.org/wiki/No-cloning_theorem
Wikidata Q1751823 (dati Wikidata in CC0 1.0) — https://www.wikidata.org/wiki/Q1751823
Autori: i contributori di Wikipedia (cronologia: https://en.wikipedia.org/wiki/No-cloning_theorem?action=history).
Licenza: Creative Commons Attribuzione-Condividi allo stesso modo 4.0 (CC BY-SA 4.0) — https://creativecommons.org/licenses/by-sa/4.0/. Il riuso richiede attribuzione e stessa licenza.
Estratto dell'introduzione non modificato nel contenuto; revisione 1358071215, consultata il 2026-10-07T12:04:43.330Z tramite l'API ufficiale di Wikipedia. Impronta SHA-256 dell'estratto: aa7e0280753588d702a29bf9c28103fce75ed05847afdb8ff642335cff9b72ab