It was begun with the invention of relativity theory and quantum theory.

That's wrong because the theory is quantum mechanical.

Yet the assumptions that quantum theory needs to make in order to deliver those predictions are so mysterious that even Feynman himself was moved to remark, If you think you understand quantum theory, you don't understand quantum theory.

So this is general relativity, this is quantum theory.

This means that quantum theory has got to be in some sense true.

So through quantum field theory, they manifest themselves as points and interact that way.

Under extreme conditions, general relativity and quantum theory allow time to behave like another dimension of space.

So the way these things are explained in quantum field theory is, all possibilities are expanding and developing at once.

CA That's right. The reason it's got a few people at least excited is because, if you're right, it brings gravity and quantum theory together.

At the same time, we physicists have been busy trying to make sense of and build on and integrate the discoveries of quantum theory and relativity.

Why? Because it is a quantum phenomenon. It's quantum physics.

And merging them together to make the final quantum theory of space and time and gravity, is the culmination of that, something that s going on right now.

And so the fact that atoms, when you heat them up, only emit light at very specific colors, was one of the key drivers that led to the development of the quantum theory, the theory of the structure of atoms.

But what is the future of quantum levitation and quantum locking?

That's quantum mechanics.

So, this is why we call this effect quantum levitation and quantum locking.

Now, that sounds esoteric, and indeed it was an esoteric pursuit, but the quantum theory quickly led to an understanding of the behaviors of electrons in materials like silicon, for example.

The phenomenon you saw here for a brief moment is called quantum levitation and quantum locking.

And now string theory comes along and says, yes, gravity, quantum mechanics, electromagnetism, all together in one package, but only if the universe has more dimensions than the ones that we see.

David Deutsch, who's talking here, in The Fabric of Reality, embraces the many worlds interpretation of quantum theory, because the worst that you can say about it is that it's preposterously wasteful.

Comic books. Quantum physics video games.

Nonetheless, they have led to important developments, because the negative results have ruled out some plausible hypotheses. And, though researchers may not have found results supporting any one theory, they have advanced the cause of science by better defining the observational criteria any quantum theory of gravity will have to take into account.

And that to me as well, that if you think I'm worried about losing worlds, well Many Worlds theory one of the most beautiful, fascinating, sometimes terrifying ideas from the quantum interpretation is a wonderful thing.

And they're understanding more about quantum mathematics.

You see, it's quantum locking, not levitation.

However, only recently, due to several technological advancements, we are now able to demonstrate to you quantum levitation and quantum locking.

The micro world of the quantum is understood.

You're actually seeing and hearing quantum information flow.

Quantum mechanics tells us all possibilities are realized.

Einstein's theory not only describes our universe, from the Big Bang to black holes it has also taught physicists the relevance of geometry and symmetry lessons that spread from particle physics to crystallography. But, despite the similarities that Einstein's theory has with other theories in physics, it stands apart by its refusal to fit together with quantum mechanics, the theory that explains the dominant behavior of matter at the atomic and subatomic scale.

But not here, because it is a quantum effect.

So without that curiosity driven understanding of the structure of atoms, which led to this rather esoteric theory, quantum mechanics, then we wouldn't have transistors, we wouldn't have silicon chips, we wouldn't have pretty much the basis of our modern economy.

The God theory is not just a bad theory.

The energy of empty space brings to life quantum fluctuations.

I do now, after learning about all the quantum stuff.

And it turns out that they behave like quantum particles.

Geometry, fantastic. You know, quantum mechanics these are cool things.

The rules of quantum theory, on which the Standard Model is built, are at root probabilistic. There will always be statistical flukes in the data, just as any series of coin tosses can produce an unexpected string of seven heads in a row.

M Theory

What theory?

In theory.

What these paradoxical interpretations have in common is that they abandon realism, the doctrine that a physical world, existing in reality, accounts for all of our experience. Anti realism remains popular and appears in various guises in textbooks and popular accounts of quantum theory.

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