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La Physique Quantique: Superposition, intrication, particules et technologies: ce qui se passe réellement dans l'infiniment petit, sans magie ni brace
Paperback
Series: Le Pigeon t'Explique - Sciences & Nature, Book 3
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Publisher: Independently Published
Pages: 132
Weight: 0.30
Height: 0.28 Width: 5.00 Depth: 8.00
Language: French
La physique quantique a un léger problème de réputation. Entre le chat de Schrödinger transformé en mascotte, les particules qui savent qu'on les regarde, les univers parallèles servis comme des faits établis et les bracelets énergétiques qui ont manifestement obtenu leur doctorat sur Internet, le mot quantique sert désormais à expliquer à peu près tout. Ce livre reprend donc le dossier là où il aurait toujours dû commencer: dans les expériences. On prépare un système, on règle un dispositif, on observe un résultat, puis on regarde ce que la théorie permet réellement d'en conclure. Pas davantage.
Le Pigeon remonte aux expériences et aux idées qui ont obligé la physique classique à céder du terrain: Planck, Einstein, Bohr, de Broglie, Heisenberg, Schrödinger et Born. Puis il ouvre la mécanique sous le capot: états quantiques, amplitudes, probabilités, règle de Born, mesure, superposition, principe d'incertitude, effet tunnel et spin. L'objectif n'est pas de réciter des mots suffisamment étranges pour impressionner un dîner. Il est de comprendre pourquoi une superposition n'est pas une simple ignorance classique, pourquoi une amplitude n'est pas une probabilité et pourquoi un électron n'est ni une petite bille ni une vague miniature qui change de costume selon l'humeur du laboratoire.
Viennent ensuite l'intrication, les inégalités de Bell, les corrélations quantiques et la décohérence. Les expériences de Bell permettent d'écarter certaines descriptions à variables cachées locales, mais elles ne donnent pas aux particules un service de messagerie instantanée. La décohérence explique pourquoi les interférences quantiques deviennent pratiquement inaccessibles dans les systèmes macroscopiques fortement couplés à leur environnement, sans régler à elle seule toutes les questions d'interprétation. Copenhague, mondes multiples, Bohm et autres lectures du formalisme peuvent alors être discutés pour ce qu'ils sont: des interprétations, pas des résultats expérimentaux fraîchement sortis d'un détecteur.
Enfin, le livre quitte les expériences fondatrices pour montrer où la physique quantique travaille déjà transistors, semi-conducteurs, lasers, horloges atomiques, IRM, SQUID et métrologie. Puis viennent les qubits, ordinateurs quantiques, correction d'erreurs, distribution quantique de clés, cryptographie post-quantique, capteurs, apprentissage automatique quantique et biologie quantique. À chaque promesse, la même discipline: quel mécanisme, quelle expérience, quelle performance, quel benchmark, quelle limite ? Parce que la physique quantique est déjà suffisamment étrange et puissante. Elle n'a vraiment pas besoin qu'on lui ajoute de la conscience cosmique et une réduction sur les pendentifs vibratoires.
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