Natural selection acts on the quantum world

In summary, the articles discuss different ways that the results of an observation can affect the system being observed, and how current models of decoherence do not allow for predictions of the exact outcomes of individual measurements. They also discuss the idea that there may be a code in nature that forces the stationary states of particles to repeat accurately, even if we do not observe them.
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  • #2
Thanks. Reilly
 
  • #3
ZapperZ said:
Quick! Read this before it goes into Nature's archive and no longer becomes free.

http://www.nature.com/news/2004/041220/full/041220-12.html

Zz.

My understanding of QM is mostly intuitive but I don't understand what was proved. It seems intuitively obvious that decoherence will lead to a agreement between observers.
 
  • #5
ppnl2 said:
My understanding of QM is mostly intuitive but I don't understand what was proved. It seems intuitively obvious that decoherence will lead to a agreement between observers.

The issue has been, at least for philosophers who like to dabble in these kinds of things, that QM seems to indicate that the world is not "objective". Via the fact that our observation of a system causes it to be affected, and that there can be a number of different outcomes of an observation, there is a propensity to say that our physical world is subjective and dependent upon who and when it is observed.

This paper negates that via indicating that there are such things as "pointer states", in which outcomes of an ensemble of states DO give consistent, objective results. It is why experiments can be reproducible! It explains why classical measurements are inherently non-subjective.

I thought it was an important paper to point out because we often have people asking questions on this issue. I don't expect people to remember this let's say a month from now when one of these things pop up again. But who knows, someone might just be able to counter any more claims about QM or our world be purely "subjective" or "indeterministic" or something along that line.

Zz.
 
  • #6
I often think of the world as indeterministic, but not subjective (although sometimes very wierd).

Our current models of decoherence don't seem to allow us to predict the exact outcomes of individual measurements, and there is the $billion question - what determines the exact outcomes? I don't think anything had been proved at all, back when I was a physics student but I have just been catching up and I am impressed that we actually seem to have made a little progress towards answering the measurement problem...with a long way to go! And I still believe in blind chance.
 
  • #7
ZapperZ said:
Quick! Read this before it goes into Nature's archive and no longer becomes free.

http://www.nature.com/news/2004/041220/full/041220-12.html

Zz.

Thanks for the reference. I also viewed another article listed in the margins which had a related theme. "More Ways To Skin Schrodinger's Cat", spoke about the inability of the superimposed states of the photon to collapse in a way that directly affects the cat without involving the surroundings. That is, the photon can not impart it's result directly to the cat in a way that we can be sure the surroundings did not contribute to the final result of the cat 'dead' or 'alive'.

The articles seemed related because I assumed that the selection process in "Natural Selection Acts on the Quantum World' is only referring to the preference for the stationary state (of say, fundamental particles in nature as well as macrosopic objects). We seem to not yet know the 'code' in nature that forces the stationary state repeatably. For the hydrogen model as an example, a photon is always forced to re-adsorb after the emission, (although it is a different photon). Nature appears to care little about our observation problem after emission and before adsorption, and therefore repeats the process accurately whether we observe it or not. Unlike the Schrodinger's Cat problem neither our knowledge nor observation is changing the result.

I found it confusing that they would refer to the 'stability' of the preferred states as 'Darwinian'. It seems that they are re-naming something we are very familiar with in physics and the term did not help me understand it further.
 

1. How does natural selection act on the quantum world?

Natural selection acts on the quantum world by favoring certain traits or characteristics that are better suited for survival and reproduction. In the quantum world, this can manifest as particles or systems that are able to adapt to changing environments or outcompete others.

2. Can quantum particles evolve through natural selection?

Yes, quantum particles can evolve through natural selection. This is because they can undergo changes and mutations, and those that are better adapted to their environment will have a higher chance of surviving and reproducing.

3. What is the role of quantum mechanics in natural selection?

Quantum mechanics plays a crucial role in natural selection by allowing for the random mutations and variations that are necessary for evolution to occur. It also helps to explain how certain traits or characteristics are selected for and passed down through generations.

4. Does natural selection only occur in the macroscopic world?

No, natural selection also occurs in the microscopic world, including the quantum realm. In fact, quantum mechanics has been shown to play a role in the evolution of certain biological processes, such as photosynthesis.

5. How does quantum evolution differ from classical evolution?

Quantum evolution differs from classical evolution in that it takes into account the probabilistic nature of quantum mechanics. This means that the outcomes of natural selection in the quantum world may not always be predictable or deterministic, unlike in the classical world. Additionally, quantum evolution can occur at a much faster rate due to the ability of quantum particles to exist in multiple states simultaneously.

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