By itself, quantum physics does not do anything. It is a useful tool, that can be used by people to explain some parts of the universe, and in particular the domain of the very small, and the very energetic.Quantum mechanics is a wonderful tool, and in the form of quantum field theory it may be the most general and successful theory in the history of science. But as with all tools, it is limited.
It is not as useful to describe what happens on a planetary scale, or a human scale, because while it might be possible in principle to describe everything with Quantum Physics, the calculations quickly become too large for our computers to manage. Fortunately, as the scales get larger, the details average out, so that larger scale and less energetic objects behave in ways that are reliably described with classical Newtonian physics, and conventional engineering and biological approaches.It is irrefutably, undeniably, incomprehensibly a quantum universe. The more we discover about the universe, the more we recognize that everything seems to be quantum.
Answer to your every question about Quantum mechanics is available with AI
Here are some of my research articles as evidence:
When most people, including experts, think of subatomic reality, they imagine particles that behave like little billiard balls rebounding off one another.
But this notion of particles is a holdover of a worldview that dates to the ancient Greek atomists—a view that reached its pinnacle in the theories of Isaac Newton.
But the “particles” of quantum field theory do not have well-defined locations: a particle inside your body is not strictly inside your body.
An observer attempting to measure its position has a small but nonzero probability of detecting it in the most remote places of the universe.
Let us suppose you had a particle localized in your kitchen.
Your friend, looking at your house from a passing car, might see the particle spread out over the entire universe.
What is localized for you is delocalized for your friend.
Not only does the location of the particle depend on your point of view, so does the fact that the particle has a location.
If you give up trying to pinpoint particles and simply count them, you are in trouble.
Suppose you want to know the number of particles in your house.
You go around the house and find three particles in the dining room, five under the bed, eight in a kitchen cabinet, and so on.
Now add them up.
To your dismay, the sum will not be the total number of particles.
An extreme case of particles' being unpinpointable is the vacuum, which has paradoxical properties in quantum field theory.
Look closely at any finite region of an overall vacuum—by definition, a zero-particle state—and you may observe something very different from a vacuum.
In other words, your house can be totally empty even though you find particles all over the place.
…the theory predicts a particularly mind-boggling behavior of the vacuum: the average value of the number of particles is zero, yet the vacuum seethes with activity.
We think of particles as tiny billiard balls, but the things that modern physicists call “particles” are nothing like that.
According to quantum field theory, objects cannot be localized in any finite region of space, no matter how large or fuzzy it is.
Moreover, the number of the particles depends on the state of motion of the observer.
All these results taken together sound the death knell for the idea that nature is composed of anything akin to ball-like particles. Dec 2015 Scientific American
The laws insist that the fundamental constituents of reality, such as protons, electrons, and other subatomic particles, are not hard and indivisible.
They behave like both waves and particles. They can appear out of nothing--a pure void--and disappear again.
Physicists have even managed to teleport atoms, to move them from one place to another without passing through any intervening space.
On the quantum scale, objects seem blurred and indistinct, as if created by a besotted god.
A single particle occupies not just one position but exists here, there, and many places in between.
"That quantum theory is outlandish, everyone agrees," says Deutsch. It seems completely in conflict with the world of big physics according to Newton and Einstein.
To grapple with the contradictions, most physicists have chosen an easy way out: They restrict the validity of quantum theory to the subatomic world.
But Deutsch argues that the theory's laws must hold at every level of reality.
Because everything in the world, including ourselves, is made of these particles, and because quantum theory has proved infallible in every conceivable experiment, the same weird quantum rules must apply to us. Discover Magazine
Quantum reality is strange in many ways. Individual quantum particles can, at one time, be in two different places - or three, or four, or spread out throughout some region, perhaps wiggling around like a wave.
Indeed, the "reality" that quantum theory seems to be telling us to believe in is so far removed from what we are used to that many quantum theorists would tell us to abandon the very notion of reality when considering phenomena at the scale of particles, atoms or even molecules.
This seems rather hard to take, especially when we are also told that quantum behaviour rules all phenomena, and that even large-scale objects, being built from quantum ingredients, are themselves subject to the same quantum rules.
Wikipedia research about Quantum mechanics
Where does quantum non-reality leave off and the physical reality that we actually seem to experience begin to take over?
Present-day quantum theory has no satisfactory answer to this question.
Whether we look at the universe at the quantum scale or across the vast distances over which the effects of general relativity become clear, then, the common-sense reality of chairs, tables and other material things would seem to dissolve away, to be replaced by a deeper reality inhabiting the world of mathematics.
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