The woo explained! Quantum physics simplified. consciousness, observation, free will

Quantum physics simplified. Are Consciousness and Free Will linked to quantum mechanics? The double slit experiment explained. What is the difference between observation and measurement? Since Quantum Mechanics is the basis of all modern microelectronics it is extremely important for you to be able to separate quantum mechanics facts from fiction.

There are misconceptions about quantum mechanics. I explain as simply as possible how quantum mechanics actually works. In 1801, British physicist Thomas Young performed a double slit experiment which showed that light was a wave, because it formed an interference pattern as a wave would. So for most of the 19th century light was considered a wave.

However, in 1887, German Physicist Heinrich Hertz discovered the photoelectric effect. This is where light can knock off electrons from atoms. But this was not triggered by certain colors regardless of the intensity, but only by higher frequencies of light. This was not the way a classical wave was supposed to behave.

This mystery was solved by Albert Einstein who proposed that light was not a wave, but came in packets of energy, photons. And the energy of these particles was proportional to its frequency of the wave. So Young and Einstein’s results seemed to be in conflict. Was light a wave or a particle?

In 1909, G. I. Taylor performed a double slit experiment such that only one photon was emitted through the double slits at a time. He showed that individual photons look like particles, but a bunch of photons behave together like a wave. This experiment was later performed with electrons which also showed the same pattern.

But people were perplexed as to what a wave of an electron actually means. In classical mechanics, Newton’s second law makes a mathematical prediction about the path a physical object will take, if you know its initial conditions. Something that showed a similar mathematical description of the wave of electrons was needed. In 1925, Austrian Physicist, Erwin Schrodinger, invented such an equation that revealed the shape of this wave function. Unlike Newton’s equation, it is not deterministic. It evolves over time. The Psi in the equation, which looks like a trident, is a wave function. In 1926, German physicist, Max Born, worked out that the psi function was related to probability.

The most accepted interpretation of the wave function, called the Copenhagen interpretation, says that until a measurement is made, this equation tells us that the electron is in all the potential positions at once. So when the measurement takes place, that’s when we say that its wave function has collapsed, because only at that point can we ascertain where where electron is or what its properties are.

And this collapse of the wave function is where the main confusion occurs in quantum mechanics. There is no equation that outlines exactly how this collapse occurs after measurement. This has been called the measurement problem of quantum mechanics.

I’ve been careful to use the word measurement instead of “observation” – which many textbooks and physicists use interchangeably. But observation in quantum mechanics does not require eyes. It is simply a measurement. So what is a measurement? When an electron bounces off an atom, that’s a measurement. An observation in physics does not mean a conscious observer. Just about anything can be an observation. If an atom in superposition interacts bumps into another atom, that’s an observation.

In the double slit experiment, when a single photon hits the screen, it collapses the probability wave of the photon. It shows up as a particle. That same photon is acting as a wave prior to hitting the screen, because it hasn’t been measured yet. The screen measures it. If enough photons are fired, you get a distribution exactly as predicted by the wave function.

The measurement made was a purely physical measurement. It would not matter if anyone or any animal looked at the measurement. Overall what we can see is that the fundamental underpinnings of nature are probabilistic not deterministic.

Does this justify free will? No. Just because free will implies that your decisions are not deterministic, and quantum mechanics implies that the properties of small particles are also not deterministic, the two are not related. There is no science linking the two.
#quantumphysics
And consciousness is not required to collapse of the wave function. The universe exists whether we are here to observe it or not.

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[hugbeaver]

This video reduces my confusion of quantum physic by 20%

[tirtunemdouq]

I can't say I understand everything, but I'm still binge watching

[GhostInPajamas]

I wish this guy was one of my teachers in high school. Hell I wish I could just sit down and ask him questions and have conversations about this stuff, I think about it all day

[StorytellerStudios]

One of my first questions upon studying Quantum Physics was this, "What exactly do they mean by "observe"? This video does a wonderful job of answering that question! Thanks!

[ts]

Schrodinger arrives at the vets to pick up his cat. The vet says, "Well, Mr. Schrodinger, I've got some good news and some bad news..."

[abspasadena]

I have been investigating these topics for many years and have NEVER heard a more clear and concise clarification of these fundamental questions! Nicely done.

[recycledminds]

It was all fun and games until Schördinger's cat started living and dying, and living and dying at the same time.

[thomaskolb]

Mr Ash is the physics teacher I wish I had. To explain something so complex in such a simple and understandable way is truly an art.

[rehmanzed]

You talk very relaxed, thats why its very easy to grasp the tiny bit information coming from you.
Thanks man for sharing the knowledges

[Nalot]

Best part: the articulation of measurement VS observation. Great work! 👏 👏 👏

[mrba]

One of the best explanations of quantum mechanics I have observed.

[samtree]

Like the way you made it clear on the difference between Observation and Measurement.

[jerry]

Thanks for taking the time to research and dispel these misunderstandings. In my opinion, the reality of quantum mechanics is much more profound than any of the misconceptions make it out to be!

[adrockc]

You are born to deliver this complicated content. So smooth. Ty!

[gwho]

thankyou for clearing up "observation".

i've always sensed that this was a vague definition, misleading, and would ask about a precise definition, but everyone seemed to not give satisfactory answers and didn't care.

you're a great teacher.

[IMMilap]

Thank you so much.. word "observation"always made me think that its some kind of magic and it can not be real physics..but it all makes complete sense when we use correct term "measurement"

[ptgms]

It's astounding how much clearer this is for me now, I was beginning to think there may be some hurdles just to high. I am going over to another link to work on my writing and spelling...I'm feeling confident now.

[buckstarchaser]

Finally, an answer to the age-old question: If a particle interacts in a forest, but nobody's around to observe it, does its probability field collapse?

[eaglenebula]

Amazing ! You actually explained the double split paradox with an explanation that makes sense.
And excluding the conscious observer clears out A LOT of misunderstanding.

[hazeldown]

Best description of double slit I've heard. The graphics are great too. Really glad I watched, thank you Arvin Ash