09 september 2006

La physique quantique pour les nuls (épisode 1)

Je me suis dit qu'un petit éclaircissement sur ce que j'étudie ici serait appréciable pour certains. La physique quantique on en a tous plus ou moins entendu parler mais presque personne ne sait vraiment ce que c'est... Je vais donc essayer, à mon niveau, d'en parler un peu pour donner une vue globale accessible. Je ne dis pas que c'est facile à comprendre, et je suis conscient qu'il faut une bonne dose de courage et de motivation pour se lancer dans cette lecture, mais j'ai fait ce que j'ai pu ! Si des moments restent peu compréhensibles ou si vous avez des questions, faites-en moi part, j'essaierai de modifier cet article en conséquence.


Qu'est-ce que c'est ?

Tout d'abord la physique quantique est une théorie scientifique, c'est-à-dire une tentative d'appropriation des phénomènes que l'on peut observer, afin de les étudier ou de les prévoir.
La théorie dite "classique", ou Newtonienne, que l'on apprend au lycée, en est également une, la théorie de la relativité en est une autre. Ce qui les différencie est le point de vue adopté, la manière de s'approprier les phénomènes que l'on observe.


Pourquoi changer de point de vue ?

Depuis Newton jusqu'au début du XXième siècle, la théorie classique a connu son âge d'or : tout ce qui se passait dans le monde semblait obéir très gentiment a ce que prédisait la théorie (somme des forces égale à la masse fois l'accélération). Tout allait bien (enfin presque) dans le meilleur des mondes, au point que certains philosophes déclaraient la science comme "complète", ou sur le point d'atteindre son but.
Mais dans les années 1900 des gens (à l'esprit un peu tordu) ont imaginé et mis-au-point des expériences bizarres... Pour comprendre leur particularité, une petite explication préalable est nécessaire.

La théorie classique sépare les phénomènes en deux classes hermétiques : les corpuscules d'un côté, les ondes de l'autre.
Les corpuscules sont des objets matériels (une balle de golf, une planète, un atome) qui ont leur existence propre. Leur nature permet de les assimiler à un point matériel (quelque chose que l'on peut montrer du doigt).
Les ondes sont des objets immatériels (une vague dans l'eau, un son, de la lumière), elles constituent un point de vue commode pour décrire l'attitude d'un ensemble d'éléments, d'un milieu (l'eau pour les vagues, l'air pour le son, certaines propriétés électromagnétiques du milieu pour la lumière). Essayez donc de montrer du doigt la musique qui sort de vos enceintes et qui arrive à vos oreilles...
Pour le physicien du 19ième siècle, les choses sont relativement simples : un ballon de foot est une particule, la manière dont se déplacent les mailles du filet des buts lorsque le ballon les heurtent est une onde (de choc). Pas de confusion possible entre les deux mondes.
L'article sur le sujet de Wikipedia donne le tableau récapitulatif suivant :















PARTICULE
ONDE
localisée, d'extension définiedélocalisée (un son peut être entendu dans toute la pièce)
création et destruction impossiblecréation et destruction facile (pincer ou arrêter une corde de guitare)
séparés, impossibles à fusionneraddition simple (interférences)

L'expérience "tordue" est au sujet des interférences.
Les interférences sont un phénomène qu'on ne peut observer qu'avec des ondes.
Il apparait par exemple si une vague arrive sur une digue percée à deux endroits proches.


Les vagues issues du trou de gauche "interfèrent" avec celles issues du trou de droite, c'est-à-dire que tantôt elles se gênent et s'annulent, tantôt elles s'additionnent. C'est ce qui est représenté par la courbe suivante, caractéristique de toutes les expériences d'interférences, représentant l'intensité de l'onde perçue selon un axe horizontal, placé après la digue:


Vous trouverez (si l'envie vous prend) plus d'infos sur la page wikipédia correspondante. Une autre image où c'est peut-être plus évident (les portes sont en bas, les vagues arrivent du bas):


(c'est beau la physique, hein ??)

C'est en revanche impossible d'observer ce phénomène pour les particules : imaginez que vous êtes devant un mur avec deux portes ouvertes et que quelqu'un de mal intentionné, placé derrière le mur, envoie des ballons de foot vers le mur (quelqu'un qui envoie des ballons de foot est forcément mal intentionné, ça c'est une théorie personnelle). Imaginons en plus qu'il envoie les ballons un par un. Certains vont passer par la porte de droite, d'autres par la porte de gauche, mais ils ne vont en aucun cas "interférer" entre eux.
Avec une seule porte ouverte on obtient une répartition plus ou moins sous la forme d'une gaussienne.
Or on peut montrer en maths que l'addition de deux gaussiennes est une gaussienne, ie si on ajoute les impacts des ballons venant de la porte de gauche aux impacts des ballons venant de droite on retrouve encore une répartition sous la forme de la courbe précédente.
Aucune chance donc d'avoir une répartition d'impacts comme la courbe rouge en théorie dans ce cas-là.

C'est ici qu'intervient (enfin) l'esprit tordu de quelques physiciens, qui, ne voulant pas faire comme tout le monde, ont justement envoyé un par un des électrons (= ballons de foot) à travers des fentes d'Young (= mur avec deux portes).
Et là c'est le drame ! Ils se rendent compte qu'en envoyant des milliers d'électrons les uns après les autres, ils retrouvent la petite courbe rouge preuve d'interférences...


Sur la première image, on envoie une dizaine d'électrons les uns après les autres. Les petits points blancs représentent les points d'impact. Dans les images suivantes, on continue à envoyer des électrons, toujours les uns après les autres, de plus en plus, jusqu'à voir apparaitre cette maudite figure d'interférence pour plusieurs milliers d'électrons. Les électrons (alors considérés comme des particules, au même titre que le ballon de foot) se comportent donc dans certains cas comme des ondes...
Et voilà ce qui a conduit à changer le point de vue et à chercher une autre vision des phénomènes. En gros l'esprit de la physique quantique c'est "merde les gars on a dû se planter quelque part, c'est où que ça bloque ?".

(au prochain épisode nous verrons en quoi consiste le nouveau point de vue adopté)

96 Comments:

Blogger Antoine said...

désolé pour le gros espace pas beau avant le tableau onde/corpuscule.
Si quelqu'un a des restes en html il est le bienvenu parce que moi à part table,td,tr...

9/9/06  
Anonymous Anonym said...

antoine, une question sûrement dégradante ; en quoi la dernière figure (avec tout plein d'électrons) où ils se présentent effectivement selon une organisation spécifique est-elle caractéristique du phénomène d'interférence entre électrons et non d'une organisation individuelle mise en évidence par le nombre ?
sylvie

9/9/06  
Anonymous Anonym said...

Coucou frerot!
Alors comment ca se passe?
Ca y est j'ai eu mon premier cour de philo (un peu strange le prof... ), apparement tu connais monsieur Veillon (ou veillan, je sais plus)
En sport, degoutée le menu athlé/danse/volley ete changé pour danse/volley/ping pong....
Donc voila des petites nouvelless de ma rentrée...
Sinon je vais voir la science des reve tout a l'heure, et je laisse le festival de puyro'land avec Maximum kouette et Skatalites..... Snif!
Les jours ne sont pas trop courts?

Je te fais de gros bisous et a + tard!!!!!

9/9/06  
Blogger Antoine said...

Sylvie : non c'est vrai ce n'est pas clair, rien de dégradant !
Si on reprend ce qui devrait se passer en envoyant les ballons les uns après les autres, rappelons que puisque chaque ballon passe soit par la droite, soit par la gauche, la repartition des impacts et la simple somme de ce qui se passe quand la porte gauche est seule ouverte et ce qui se passe quand la porte droite est seule ouverte.
Avec une seule porte on obtient une répartition plus ou moins sous la forme suivante (gaussienne).
Or on peut montrer en maths que l'addition de deux gaussiennes est une gaussienne, ie si on ajoute les impacts des ballons venant de la porte de gauche aux impacts des ballons venant de droite on retrouve encore une répartition sous la forme de la courbe précédente.
En aucun cas, avec une nature purement particulaire, on ne peut voir apparaître une figure caractéristique du phénomène d'interférences (courbe grise).
Le terme "interférences" est pour cela explicite : il faut que ce qui passe par la porte gauche "réagisse", "gêne", "interfère" avec ce qui passe par la porte de droite.
Ce qui est donc surprenant dans l'expérience expliquée est que l'apparition de cette figure d'interférence parmis les impacts semble montrer que les électrons passant par la porte de droite interagissent avec ceux qui passent par la porte de gauche, ce qui est impossible puisque chaque électron est envoyé après que le précédent a fait un impact (et disparait du milieu par absorption).

J'ai changé un peu ce paragraphe dans mon article, et ajouté quelques photos, j'espère que c'est plus clair maintenant.

Marine : oui oui Veillon je connais bien ! Il est très sympa, et je connaissais bien sa fille, qui s'appelle Marine aussi si ma mémoire est bonne. Danse volley ping pong c'est pas si mal, j'avais pareil avec natation à la place de la danse.
Pour la science des rêves j'attends ton avis, j'ai vraiment bien aimé les séquences symboliques dans la boîte en carton, et toutes les inventions imaginaires.
Bises à toutes les deux !

9/9/06  
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Anonymous Anonym said...

Salut. C'est super intéressant ton article. Je m'intéresse à la physique
pour essayer de modéliser en informatique le mouvement et l'interaction entre objet, et je me demandais par rapport à ton article si il y a déjà des lois (des formules) qui établissent ce phénomènes...?
En tout cas tu as raison, déjà que c'est pas facile, avec la physique quantique, on est encore plus perdu ^^

27/5/08  
Anonymous Anonym said...

Coucou vous tous! je voudrais seulement vous laisser un petit message de rien du tout... moi simple personne non étudiante et de loin... Arrêtez de vous triturer le cerveau et comprenez les choses telles qu'elles sont sans vouloir (au début), essayer de relativiser a l'extrême! il est évident que beaucoup de nos paires (pères si vous voulez) ont planché sur la question... Soyons naturels et tout viendra! La compréhension des choses aussi en laissant le naturel agir et prout!! bisous et bonne continuation dans vos études p.s je suis passionné de physique quantique!

20/4/09  
Anonymous Bertrand said...

salut antoine
juste une question de quelqu'un qui n'a aucune connaissance en mécanique quantique et qui te paraitre idiote
mais aprés l'impact d'un atomes est-ce que celui ne dégage pas une onde de choc si infime qu'elle soit pour pouvoir interferer avec le résultat de l'atome qui le suit.
merci de répondre le plus simplement du monde si c'est possible merci

26/6/09  
Blogger Antoine said...

(pour Bertrand) non, il n'y a pas d'onde de choc autour du point d'impact de l'électron, celui-ci est un peu comme un impact de balle de pistolet dans un mur en beurre : le dispositif expérimental fonctionne par absorption.
De plus, tu vois sur la figure en 4 parties que le motif de la forme d'interférences qui se créée est allongé dans la direction verticale. Ceci ne pourrait être expliqué par une action d'ondes de choc, qui vont forcément dans toutes les directions.

2/7/09  
Anonymous Anonym said...

Bonjour,

Bien l'épisode 1: à quand le 2 ...?

Merci.

Marco

18/12/09  
Anonymous Anonym said...

j'attends moi l'épisode 2 !!!!!!!

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Anonymous Anonym said...

Den här kommentaren har tagits bort av bloggadministratören.

23/1/10  
Anonymous Anonym said...

bonsoir. Je ne connais vraiment rien à ce domaine mais je ne demande qu'à apprendre. Pour cela, il me faut bien comprendre. Ma question est plutot simple : a la place du ballon j'imagine disons une pasteque, je suis devant ce mur avec 2 fentes...les fentes sont assez proches... je tape si fort dans ma pasteque qu'elle s'éclate contre le mur. Quelques morceaux passent dans les fentes. Jusqu'ici, c'est possible ? Alors dans ce cas pourquoi les particules ne peuvent s'interferer apres les fentes? car chaque particule va suivre un chemin linéaire ? Désolé pour ma question mais je souhaite en savoir plus. Merci

8/2/10  
Anonymous Anonym said...

Autant pour moi, je suis trop nul! LOL Merci Et la suite???

8/2/10  
Anonymous Anonym said...

Den här kommentaren har tagits bort av bloggadministratören.

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Anonymous Anonym said...

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20/2/10  
Anonymous Anonym said...

tres interessant, merci

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Anonymous Anonym said...

ben et l'episode 2 de la physique quantique pour les nuls, alors? tu fais attendre les ignorants...

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Blogger gerardphil said...

Même remarque que les derniers commentaires : A quand la suite ?

Phoenixlechat

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Anonymous Anonym said...

Vraiment très intéressant, à quand la suite ?

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Anonymous Anonym said...

Bon ben moi je suis un novice complet mais je me pose la question:
On parle bel et bien d' électrons (particules chargés d' un courant négatif) et l'on voit que si on approche 2 poles négatifs de 2 aimants ceux ci se repousent, les aimants sont des particules et le champ électrique de chaques poles sont des ondes (enfin je suppose) ne se pourrait il pas que les
électrons en se repoussant provoque une telle interférence et que c'est le déplacement linéaire des électrons qui donne cet effet de ligne verticales dans les résultats. (finalement g trouvé moi meme la réponse et c'est non car si comme je l'ai compris l'image resemble dison a un mur criblé d' impacte de balles alors les espaces seraient + ou - équidistants et les interférences serait de petits cercles n' est ce pas) (bon je l'avoue j'ai 16ans je suis en 3e secondaire mais je l'ai déja redoublée) mais la physique quantique m'intéresse même si je développe des théories personelle (probablement érronées) sur l'existence d'autre "dimension" (univers parallèles) et certaines théories sur l'espace-temps ainsi que sur l'existence d'un tout "dimesionel" basé sur un pricipe d'équilibre des forces énergétiques qui selont mes théories en cas de déchirures spatio-temporelles ou dimensionelles se reformerait en provoquant un évènement qui empècherait l'apparition de cette décirure et donc d'un retour a l'équilibre (ce qui donne étrangement un coté "vivant" à ce "tout") merci de ne pas etre trop dur a ce sujet. et appelez moi Bogy

2/9/10  
Anonymous souhaila said...

merci pour ton article. c est tres attirant pou moi ,je me met de suite a essayer d etudier la physique quantique,a tres bientot.

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Anonymous Anonym said...

Merci antoine, je suis un eleve de 4eme. J'ai pu comprendre plus ke la moitie de ton article, alors je trouve ke ta tres bien expliquer pour que qqun comme moi puisse comprendre

9/11/10  
Blogger Pap said...

Salut Antoine,

Bon, puisque, de toute façon, je suis bien parti pour devenir fou,je reviens sur le commentaire de Bertrand (26/06/2009) parce-que je ne vois vraiment rien d'autre.
Il me semble qu'une balle de pistolet tirée dans un mur de beurre doit -forcément, bordel !!- produire un choc, si imperceptible soit-il, qui, dans le cas des électrons, raménerait l'expérience à une simple interférence d'ondes. Sinon, je suis prêt à être pris en charge à Nuthouse.......

Cordialement !!

Pap

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