Educational synthesis of quantum physics

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dedeleco
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by dedeleco » 26/11/10, 16:27

I put the references and some explanatory landmarks for 83 years of research on the fundamental problem of quantum mechanics, which allows us to understand our universe with great precision (9 decimal on a constant by summing over all the possibilities)
http://en.wikipedia.org/wiki/Precision_tests_of_QED
Quantum Electrodynamics (QED),
The Agreement Found This Way is to within ten parts in a billion (10-8)
This Makes Qed One of the Most Accident Physical Theories built Thus Far.

but which does not allow us to understand how we pass from a microscopic world with all delocalized particles like waves everywhere at the same time, with diffraction like light, to a macroscopic world where we are in one place at a time and not in Paris and Brussels at the same time, like the electrons !!
Also there are 83 years of work on measurement in quantum mechanics with different models which include more or less clear philosophical presuppositions !!
I invite you to watch them in the links indicated !!
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renaud67
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by renaud67 » 26/11/10, 17:25

like quantum physics does it explain why electrons and protons have a charge and the positivity of one and the negativity of and the other :?:
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dedeleco
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by dedeleco » 26/11/10, 23:13

does quantum physics explain why electrons and protons have a charge and the positivity of one and the negativity of the other

this question is of the type why the world is like this!
I put very detailed links to read, summaries of 400 years of physics, given the crucial importance of the question that affects the very origin of our world !!

Physics notes experimental facts, deduces from the rules, elementary particles with basic laws governing all of our world in a coherent manner like opposite charges:
particle physics
http://fr.wikipedia.org/wiki/Physique_des_particules
http://en.wikipedia.org/wiki/Particle_physics
in fact the charges exist in the form of charge quarks + -1 / 3 and leptons as charge electrons + -1 quantified by quantum mechanics which explains it if there is only one monopoly in our universe:
Dirac showed that the existence of magnetic monopoles was consistent with Maxwell's equations only if electric charges are quantized, which is always observed.

http://en.wikipedia.org/wiki/Magnetic_Monopole
http://fr.wikipedia.org/wiki/Monop%C3%B ... C3%A9tique
http://fr.wikipedia.org/wiki/Quark
http://fr.wikipedia.org/wiki/Lepton
but to determine why the basic fundamental laws are so and not otherwise we should be in the place of the one who created the initial conditions of this world as it was 13 billion years ago !! very specific bizarre conditions for us and the universe to exist
http://fr.wikipedia.org/wiki/Big_Bang
with a very precise adjustment of the initial values
http://fr.wikipedia.org/wiki/Ajustement_fin
http://en.wikipedia.org/wiki/Fine-tuning
http://fr.wikipedia.org/wiki/Principe_anthropique
http://en.wikipedia.org/wiki/Anthropic_principle
http://en.wikipedia.org/wiki/Anthropic_principle
http://fr.wikipedia.org/wiki/Multivers
http://en.wikipedia.org/wiki/Multiverse
with cosmic inflation at the beginning of the universe making the adjustment less precise:
http://fr.wikipedia.org/wiki/Inflation_cosmique
Finally, there are fundamental problems to be resolved:
http://fr.wikipedia.org/wiki/Liste_de_p ... a_physique
http://en.wikipedia.org/wiki/List_of_un ... in_physics

Furthermore quantum mechanics gives the possibility that we are by chance in a world among an immensity of others possible with all kinds of physical laws, universes of short duration or long duration, with or without possible life, all being realized in parallel without stop, as the exact equations of quantum mechanics sum up on all possible stories without any other philosophical hypothesis imposed by this very strange and disturbing result !!
So it is possible that our world is the result of pure chance among a multitude of universes, uncomplicated god, trying all possible universes with quantum mechanics which sum coherently (with wave interference) on all stories and possibilities at the same time !!
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by bernardd » 30/11/10, 15:49

renaud67 wrote:like quantum physics does it explain why electrons and protons have a charge and the positivity of one and the negativity of and the other :?:


As dedeleco says, the why is not explained by a scientific approach.

But you will find in the Tuesday conference (from memory) a good explanation on the difference in fermions and bosons, which is the same difference between protons and electrons.

And in the Wednesday one, you will find explanations on the organization inside the nucleus, protons and neutrons.
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by bernardd » 30/11/10, 15:53

A very recent article on the constitution of a BoseEinstein condensate of photons at room temperature:
Researchers Get Trapped Photons to Act Like Massive Particles

It seems like a big step towards an optical quantum computer.
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by dedeleco » 30/11/10, 15:59

a good explanation of the difference in fermions and bosons, which is the same difference between protons and electrons.

Funny because this sentence with a nice salad shows poor listening to the presentation!
Protons and electrons with spin 1/2 are both fermions and not bosons at all !! !!!
The quantum physics and mechanics baba !!
To listen to again with care and above all to write Wikipedia!

http://en.wikipedia.org/wiki/Fermion
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by bernardd » 30/11/10, 16:19

Thank you, if I am interested in these conferences, there is a reason. But I have preferred photons for a long time :-)
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by dedeleco » 30/11/10, 18:03

10 years ago, we did a real quantum computer with nuclear spins on a pretty molecule with spins and 7 qbits with a classic magnetic resonance apparatus on spins of atomic nuclei !!
So far this is the max number of qbit really functional!
Nature 414, 883 (2001) and read:
http://www.nature.com/nature/journal/v4 ... 4883a.html
http://www.utinam.cnrs.fr/Ordinateur-qu ... -a-base-de
http://en.wikipedia.org/wiki/Nuclear_magnetic_resonance
http://xstructure.inr.ac.ru/x-bin/revth ... 521&skip=0

http://en.wikipedia.org/wiki/Quantum_computer
http://fr.wikipedia.org/wiki/Calculateur_quantique
If we improve the signal on noise, we can make quantum computers on much larger molecules.
In this case we manipulate each spin perfectly of each molecule which individually keeps its coherence and the only problem is the signal on noise.

Any microscopic phenomenon, a molecule, etc. can make a quantum computer but the difficulty is to manipulate each qbit element and the interactions as desired without losing coherence.

With a large number of qbit, the coherence will be very difficult to maintain, worse difficulty than the signal on noise in magnetic resonance.
We manipulate the orientation of the magnetic moments of the nuclei with photons of radio waves !!

Finally for: Researchers get trapped photons to act like massive particles
http://arstechnica.com/science/news/201 ... ticles.ars
the mass of these photons is that of the electron clouds of the coloring molecules excited by the photons so strongly that they are coherent electrons mixed quantitatively with the photons trapped in these molecules by their electrons !!
They're not entirely sure what to do with it at the moment,

and the quantum computer is far away with this experiment, much further than with the magnetic resonance of spins !!
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by bernardd » 30/11/10, 20:14

In Friday's talk, there are pictures, with component "qbits" of a quantum computer, visible to the naked eye, and this Tyrolean lab comes up with 16 or 32 qbits on a component.
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Re: Educational synthesis of quantum physics




by Christophe » 27/06/21, 17:48

This is the first time that I understand quantum physics so quickly in 1 image ... : Mrgreen: : Mrgreen: : Mrgreen:

Schrödinger.png
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