Educational synthesis of quantum physics

[bernardd]

The basis is explained at the Wednesday conference, but it is better to see the 2 other conferences of the week before.

Averett's hypothesis is currently unfalsifiable, and therefore more in the realm of philosophy.

And even without it, what is proven is already largely surprising and wonderful.

[dedeleco]

Averett's hypothesis is more in the realm of philosophy.

No, because Everett has only said what is written in the equations to the letter, while all the other interpretations are philosophies blindly refusing this fact written in the equations proven by the experimental facts !!
It is exactly like formerly affirming that the earth is the center of the world by refusing what is written in the equations of the observed movement of the stars !!
Much more, a quantum computer with a large number of qbits (not much 256 or 512) with 2 to the power 256 or 512 of states: 2 ^ 512 states explored all at once in parallel, (in fact more, than the number of atoms in the universe, says Deutsch), will prove by its power these parallel worlds for sure !!

This is proven by the quantum behavior of molecules with a large number of atoms (and also of atomic nuclei with more than hundreds of nucleons) that'it is impossible to calculate or simulate on conventional computers, which must explore one after the other each of these parallel worlds (called to hide it, stories, paths, diagrams, etc.) which for a conventional computer takes a time equal 2 ^ 512 the time to calculate a possibility, even taken at the nanosecond, or 2 ^ 512nanaoseconds = 10 ^ 42s approximately which remains astronomically long much higher than the age of the universe !!!
However, these usual and basic molecules or real particle systems work quantum, as well as superconductors of the varie types (at high temperatures which remain incomprehensible because of this total impossibility of simulating them with a conventional computer beyond 5 to 10 particles !! ) or the quantum Hall effect, and many others like the fullerene molecules with 6O and more carbon atoms which are totally quantum and which alone isolate explore a number of worlds (or possibilities, or coherent stories) already astronomical! !
Even more, we hope that the quantum computer will allow us to explore these worlds, to calculate and finally understand high temperature superconductors !!
In fact any isolated molecule is a quantum computer but without being able to control its functioning, in fact the only problem is to succeed in controlling the functioning of each element !!

So Averettt has nothing to do with philosophy, since it is necessary to calculate on this number of parallel worlds (camouflaged in another term, like diagrams, or histories) with a conventional computer currently, to determine the least quantum property, of molecule, atom, or even mass neutron, (huge calculation still accessible at the limit) !!
Anyone who has done calculations in quantum mechanics of a complex system comes up against this wall of the explosive number of parallel worlds to explore, possible only with a quantum computer !!
So it's not a philosophy, it's a concrete reality stifled to refuse to tell this truth, on the contrary full of far-fetched philosophies to refuse the obvious !!

[bernardd]

Applications to the quantum computer is the Friday conference.

That there is a juxtaposition of states is in the equations.

But to use the word "universe" by analogy with the word we use in current human perception, it is not in the equations.

[dedeleco]

That there is a juxtaposition of states is in the equations.

Improper term: juxtaposition, showing a complete misunderstanding of quantum mechanics, in fact it is at the same time delocalized in several places at once (chemical bonding electron) or with coherent amplitudes at the same time 0 and 1, or at the same time alive and dead and not at all juxtapose a dead cat next to a live schrodinger cat !!
If we measure several times on a single cat, we get sometimes dead, sometimes living at random according to the square of the amplitudes of probability and its evolution is coherent (wave) on both dead and alive for a single cat (nothing to do with juxtaposition) !!
http://fr.wikipedia.org/wiki/M%C3%A9canique_quantique
More when we want to calculate on the slightest system non-elementary like a slightly large molecule or a nuclear nucleus full of quarks (almost incalculable too), the number of coherent states (which each follows a particular history) is greater than the number of atoms in the universe !!!!!

So it makes sense to change misleading words in class and talk about worlds or universes in parallel, in the smallest quantum molecule, given the number of possibilities in parallel.
The microscopic world has a level of complexity infinitely higher than that of the universe visible on our scale !!

[bernardd]

I just wanted to say that for the system studied, and in the absence of measurement, we only know the probabilities of all the possible states in the corresponding Hilbert space.

It is just in this sense that I spoke of the juxtaposition of these states.

But if you want me to explain every word I use, it will get a little heavy to read

[Cuicui]

I recommend this site, which contains 5 conferences that have just taken place in Geneva.

Very good idea to have launched this topic. Thank you Bernardd. I will finally be able to educate myself a little on this subject that I only knew by name and of which I do not know everything.

[bernardd]

With pleasure, good discovery.

At this level, it is more art than science.

[dedeleco]

To make you puzzled:
very serious quantum Darwinism
There are so many parallel worlds or universes multiplying so quickly that we have invented a selection of the strongest of these worlds like Darwin to eliminate all these possibilities which disturb in the equations by multiplying us constantly, idea too disturbing, that we constantly has trillions of twins like us who live a different future in parallel worlds !!
Passing pass is the same type as the collapse of the wave function made on the equations to eliminate what is embarrassing philosophically: our universe multiplies trillion times per second with as many twins as we who live in different futures! !
However for the calculations of what we observe we do not hesitate (and it is necessary to quantitatively describe the experimental reality) to sum up on all possible past stories (with the vocabulary: diagrams, excited virtual states, paths, diagrams , etc.) in an astronomical number (which will be used in the quantum computer to give it its incredible power) and there we do not remove them at all, with ad hoc Darwinism, otherwise it is impossible to describe experimental reality !!
Also, common sense not self-centered on our world, leads to follow the equations without adding ad hoc hypotheses and therefore to accept the existence of worlds parallel to our multiplying with all the possible stories that have not happened to us !!
It is the only way, without ad hoc artifice, to explain how we go from the microscopic (or any particle is delocalized in a large number of places) to our macroscopic scale where we are in one place and not in several times as in Paris and Brussels, but with the relocation that has become, according to the equations, that of our twins living different lives or stories in parallel worlds !!

Quantum Darwinism
http://en.wikipedia.org/wiki/Quantum_Darwinism
http://arxiv.org/ftp/quant-ph/papers/0306/0306072.pdf
http://www.technologyreview.com/blog/arxiv/24630/
http://www.fqxi.org/data/articles/QuantumDarwinism2.pdf
http://www.nature.com/nphys/journal/v5/ ... s1202.html
http://arxiv.org/PS_cache/quant-ph/pdf/ ... 5031v2.pdf
http://arxiv.org/PS_cache/quant-ph/pdf/ ... 8125v3.pdf

The decoherence is without philosophy because it is the decoherence by destructive interference as for the wave light which is propagated in a straight line by these destructive interferences except on the straight line and therefore this decoherence is crucial in the passage from quantum to classical, as for wave optics to geometric optics.
There exists on this fundamental subject an immense literature and a lot of philosophy to justify the ideas a priori !!

It is science on the edge of its limits with philosophy and beliefs, and not only art !!
The problem for 83 years:

Emergence of a classical reality within the quantum
Universe has been the focus of discussions on the interpretation
of quantum theory ever since its inception.
Measurement - the process through which we learn
about the world - has the power to transform fuzzy
quantum states into solid classical facts. Understanding
measurements has been therefore rightly regarded as the
key to unlocking the mystery of the quantum-classical
transition since the early days [1]. Bohr's interpretation
proposed in 1928 [2] introduced the classical domain “by
hand ”, with a demand that much of the Universe - including
measuring devices - must be classical. this
Copenhagen interpretation proved to be workable and
sustainable but is ultimately unsatisfying, because of the
arbitrary split between “the quantum” and “the classical” .....
the ultimate question — why do we perceive just one of the
quantum alternatives?—Within the context of physics. Indeed, one might be tempted to follow
Eugene Wigner (1961) and give consciousness the last word in collapsing the state vector.
I shall assume the opposite. That is, I shall examine the idea that the higher mental
processes all correspond to well-defined, but at present, poorly understood information-processing
functions that are being carried out by physical systems, our brains ......
Our senses did not evolve for
the purpose of verifying quantum mechanics. Rather, they have developed in the process in
which survival of the fittest played a central role. There is no evolutionary reason for perception
when nothing can be gained from prediction. And, as the predictability sieve illustrates,
only quantum states that are robust in spite of decoherence, and hence, effectively
classical, have predictable consequences. Indeed, classical reality can be considered as nearly
synonymous with predictability.

It's like a billboard which floats multiple copies of the information about our universe all over the place.
-Wojciech Zurek

[bernardd]

interesting theory, we already mentioned it, but if you could put your last post on another thread where we can discuss it without filling this one?

[sen-no-sen]

To make you puzzled:
very serious quantum Darwinism
There are so many parallel worlds or universes multiplying so quickly that we have invented a selection of the strongest of these worlds like Darwin to eliminate all these possibilities which disturb in the equations by multiplying us constantly, idea too disturbing, that we constantly has trillions of twins like us who live a different future in parallel worlds !!

Could you explain this theory of "Quantum Darwinism"?