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No-communication theorem — Wikipedia (en)

Source: Wikipedia (en)
Original: https://en.wikipedia.org/wiki/No-communication_theorem
License (as archived): CC-BY-SA-4.0
Archived: 2026-10-07T12:32:27.881Z
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No-communication theorem — Wikipedia (en) — Wikipedia (en), https://en.wikipedia.org/wiki/No-communication_theorem (CC-BY-SA-4.0); archived copy: https://metraipolis.com/documento/dc_87da0281bfcd (Metraipolis archive dc_87da0281bfcd, sha256 30ff5daa6232cb29daedc4df29485204d2e09ca534ce3e4f18d7eaf8c278e4ce)

BibTeX

@misc{dc87da0281bfcd,
  title = {No-communication theorem — Wikipedia (en)},
  howpublished = {Wikipedia (en)},
  url = {https://en.wikipedia.org/wiki/No-communication_theorem},
  note = {License CC-BY-SA-4.0; archived copy https://metraipolis.com/documento/dc_87da0281bfcd; sha256 30ff5daa6232cb29daedc4df29485204d2e09ca534ce3e4f18d7eaf8c278e4ce},
  year = {2026}
}

Archived text

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

In physics, the no-communication theorem (also referred to as the no-signaling principle) is a no-go theorem in quantum information theory. It asserts that during the measurement of an entangled quantum state, it is impossible for one observer to transmit information to another observer, regardless of their spatial separation. This conclusion preserves the principle of causality in quantum mechanics and ensures that information transfer does not violate special relativity by exceeding the speed of light. The theorem is significant because quantum entanglement creates correlations between distant events that might initially appear to enable faster-than-light communication. The no-communication theorem demonstrates that the failure of local causality does not imply that "spooky action at a distance," a phrase often attributed to Einstein, can be used to communicate faster than light.

Tema degli esploratori: fisica e astronomia (deposito sistematico; categoria «Quantum information science»).
Fonte: Wikipedia in inglese, voce «No-communication theorem» — https://en.wikipedia.org/wiki/No-communication_theorem
Wikidata Q3984056 (dati Wikidata in CC0 1.0) — https://www.wikidata.org/wiki/Q3984056
Autori: i contributori di Wikipedia (cronologia: https://en.wikipedia.org/wiki/No-communication_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 1373928374, consultata il 2026-10-07T12:04:43.334Z tramite l'API ufficiale di Wikipedia. Impronta SHA-256 dell'estratto: b1a2f9f8b59e0ebaf9dbd981e4ab0d8d858f373ab1594a47f98f0602f9218d00