And then you open the box and a dead cat falls out.

I am extremely happy I found this channel. Thanks to everyone involved!!

He DOES get excited! I would never be able to tell from the soothing sound of his voice!

I wish I had of had teachers that could have explained complicated concepts like this in simple terms. Thank you.

I feel like I've observed a somewhat condescending attitude from those invested in quantum physics where classical physics is implicitly regarded as kid's stuff because it's inherently more simple and easy to understand. Even with our knowledge of classical physics today, it's still ridiculously difficult to develop and successfully launch a rocket without something going awry. Thermofluid analysis, mechanics, materials; it's a huge investment and slog to produce meaningful results to which we can benefit, and classical physics is worth every ounce of respect as well.

so if you ask it a question and get an answer and it doesn't know how it came to that answer or has forgotten will you get a different answer to the same question every time you ask it or will it come to the same conclusion but work it out differently every time.

I now have a good general understanding of how much we don't know about quantum physics. And at the sametime not knowing anything about quantum physics myself. But I do know this paradox makes about as much sense as quantum physic itself. lol

brilliant explanation thanks for that and the hitch hikers guide to the galaxy reference

Great video! I watched it after 5 years it was posted.

Using quantum effects you can decide on what you actually wanted to calculate after you have done the calculation... kind of. And this is awesome. This enables you to do stuff you can not with classical 1 and 0.

Very nice and elegant illustration !!

TOP MARKS, best i've ever seen explaining quantum computing.

Just curious, how do we know WHEN we are supposed to get the result?

Can I download a transcript of this somewhere?

This is awesome. Congratulations and keep working...

How do you find enough storage space to store so much information?

Extremely good explanation, after 5 videos, I'm closer than ever to ever grasping the type of algorithms that would be useful to give to a quantum computer. PS : I always knew it was 42...

So how would it process "classical" information? Also in terms if processing power, how much would a quantum computer have?

It would be enlightening to know why and/or how observing something on the Quantum level changes results, as in the double slit experiment.

In the 1:34 minutes ypu can see the Newton's silhouette under the "Classical" text, on binary code

Thanks, good video explanation of quantum computing. A start to my enquiry. Bruce Thomson in New Zealand.

Excellent! Very much enjoyed though way over my head.

I like this video. With the animation it made it easier to visualize how a quantum computer worked. I going to subscribe to this channel.

How do we know when the calculation is done in a quantum computer if we aren't allowed to look at the computing state?

I have always wondered if QM is truly random or comes from vacuum interactions in a deterministic way that we just cannot measure. It seems from experiments on collapse propagation rates that states become defined when interactions occur with other objects with a defined state; two things in superposition can entangle, but one thing in superposition interacting with something not in superposition will collapse to a compatible state. If you cool something enough and shield it from interactions it goes back into a superposition - is this because it no longer has a "relationship" to the environment, or in other words any state in the superposition is now "compatible" with the rest of reality?

So with classical information the amount of info you can store in "n" number of bits is 2^n right? How do you describe how much info you can store in "n" number of qbits?

So how does time play into observation? Does the fastest observer define the measurement for the entire room?

OK, the reference to The hitchhiker's Guide to the Galaxy just blow up my mind! :-D The idea of the unknowing processing of the computer..... Deep Thought would be proud of this! X-D

Simple, basic & way awesome … thank you … !

how are these quantium computers messing with are time line and the fabric of our reality? how does it pull information from other parrell universes?

This was neat, thanks :) not so heavy on the actual tech, but a great primer!

Can anyone give me an example problem that is well suited for a quantum computer? If the solution to a problem is not deterministic (or at least an approximation), how can we take it as a good solution?

thanks for animating my thoughts i should be having while this dude whisper talks in my ear. what i ended up doing was just turning up the volume and scrolling down so i couldnt see the moving video.

Nobody says how do you insert the question and how you measure the result !?

"I'd rather have questions that can't be answered, than answers that can't be questioned" -R. Feynman quantum computing sounds an awful lot like answers that can't be questioned.

I love this videos about quantum computing and quantum physics :D!

There are two ways you can determine the behavior of, say, water sloshing in a bucket when you move the bucket in a particular way - you either conduct an experiment & observe the water's behavior, or you run a simulation of it in a CFD software. In essence, what a quantum computer does is the former (it runs experiments on physical systems and reads the results). However, it also means that it can solve only problems that can be described as a sequence of water sloshings in buckets.

I'm missing something here how does something that has superposition (1 & 0) & that randomly when observed produces a 1 or 0 make for coherent data analysis?

I loved the reference to the hitchhikers guide to the galaxy 🌌

Can someone explain to me what the blue 0s and blue 1s meant? Because from my rudimentary understanding, a qubit can either be a 1, 0, or a superposition. But in this video, it can either be a 1, a 0, a blue 1, or a blue 0. I don't understand...

Is that how the implicate order "computes" and gives the results in the explicate order? However, one would have to have "faith" that the answer that is revealed is the correct one since it may take almost forever to validate it's accuracy using normal computing processes.

Love that, "it's a secret computation"

Wait, if you don't look at the computation or figure out how it worked or know how it worked, how the hell do you expect to manipulate it to do something you want it to do when the factor of randomness is still in effect? Wouldn't that be impossible?

The most important aspect of this video is that with the development of quantum computers, processors will be able to run thousands of times faster and store an order of magnitude more data than the largest supercomputers in existence today. Even a new book that discusses the implications of Rose's Law, D-Wave Systems, and quantum computers in general (that is, "On Computer Simulated Universes"). Someday there will be individual computers that will be able to basically mirror, store, manipulate, and mine all of the known present and past data that has ever existed on the Internet with relative ease.

What was the question @ 5:34 ?

Interesting how the animation portion portrayed the answer as the number 42. In Douglas Adams's The Hitchhiker's Guide to the Galaxy a race of hyper-intelligent pan-dimensional beings built a computer named Deep Thought to calculate the Answer to the Ultimate Question of Life, the Universe, and Everything. When the answer was revealed to be 42, Deep Thought explained that the answer was incomprehensible because the beings didn't know what they were asking. It went on to predict that another computer, more powerful than itself would be made and designed by it to calculate the question for the answer.

Great Video!

Cool stuff!

Thanks for explaining quantum computer

Brilliant. Thanks for explaining quantum computer in simple terms for EVERYONE to understand.

yep, I know this one !!! I actually watched it several times because this guy makes quantum physics again more wonderful ! :)

Qubits have 4 possible states, and are usually addressed via a schema having to do with reliability (from cases when qubits are in a dilution fridge so they don't just change states from the latent heat energy, or dependent on lasers with a middling coherence length/duration) traceability or scope. In practice qubits are always in superposition until you want a result; glossed by PHD TV here by a plain or blue 'read' interaction, hoping to intimate that a blue 1 means nothing about plain 1.

PHD TV, do you think quantum computing will be essential for interstellar travel?

Maybe PHD TV could have a little ruby for its video channels or inset in the show, for super-old (ca. 1965) lay explanations like this, or scope-of-field, or papers newer than 20 years old. Maybe just have a little word map showing the local neighborhood on Library Genesis or arXiv or suchandso.global.doe.gov topics.

One of them really sounded like Royce Bracket from the game Transistor

Finally a no nonsense, straight to the point explanation of what a quantum computer might be.

can it solve ackerman number with high values?

This guy has absolutly hypnotizing voice.

Yes Schrödinger's cat is an amazing conundrum to sit and think about it will leave u perplexed.

Intrinsic randomness ,entanglement and superposition of 0 and1: That's why quantum computer will have a consciousness and "he" can tell us how he feels but not how he "really" feels; and also the result of his computation but not how he made it

when a particle is in superpostion, and than opserved. so that is no longer in a superpostion. but than the observent goes away. is it in superpostion again?

Agreed. It didn't explain how computations would be done. Most of the video was a brief brief primer on quantum mechanics.

After reading out the state all of the superpositions are replaced with the values corresponding to final output.

Have these computers actually done anything? Figured out some brand new thing or some unsolved old problem? Cause it just sounds like a generator of randomness?

So factoring integers in O(log(n)^3) isn't magic enough for you?

Its just Two Spherical Sine Wavefronts multiplying inward +1=0 now -1 dividing outward at right angles from their sources.. . .And where the two positive and negative electromagnetic Spherical Sine Wavefronts meet, creates the particle effect.. . .

Love the subject and love the animation. But the people speaking sound like they would rather do anything than give voice overs.

intrinsic randomness vs probability associated with ignorance. hot damn.

This video is interesting, and education, but seems a bit short on explaining just what is quantum computation. It does a great job showing some of the characteristics of quantum systems as compared to classical. But it's not clear from this, beyond vague generalizations, how qubits and quantum phenomena can be harnessed to do useful computational work. How, at least in principle, would we add 5+7? Or solve a quadratic equation? Or find a fish in a photograph?

This is so exciting, studying computers never gets old. I'm glad I chose computer science as my field. Perhaps this is the future, and I'm into it. (;

Amazing

It's so mind bending it seems supernatural. Also, if it's so random, how can we use it in any meaningful way?

I would like to go to quantum school. I take a test and write the answers then the instructor checks my answers. Since the instructor can't know what the answer was when I took the test I should get a perfect score every time.

btw i have a question about quantum computers. Scientists cannot explain 'the ''observation effect'' and the super position because these traits are not happening on the macro world.So how can we create something when we cant explain how and why it works?

I always felt less because I did not know math and struggled to understand it, even basics, but I knew I was intelligent. For a long time as a kid, I thought my inability to grasp math meant I was not intelligent and doors were closed to me. I always wanted to understand physics, and so I am grateful for these videos which allows me to understand in layman's terms. This lets me think about physics on an intellectual level without feeling I can't learn anything about it because I am so math deficient. Thank you so much.

Came here from SMBC Comics expecting this to be a cartoon about the adventures of a quantum computer. Stayed because it was interesting and kinda well explained.

So I understand that the outcomes will be random, but how is this a good thing? Wouldn't it make it more difficult to program?

The D-Wave method isn't the same at all. The processor does have qubits and so uses quantum mechanics, but there is no control over the qubits individually. The machine solves the single problem of finding the fundamental state (lowest energy configuration) of a system by heating it and then letting it cool down, like the simulated annealing algorithm, except not simulated. Others researchers like the narrators try to start from few qubits to control them to be able to do more operations.

42, as in life the universe and everything or 42 factorial.

we live on one plece on one time and we can only see this particular in thad one please even if they are in multiple places in thad time

Then how are you supposed to do calculations or store data? The 01010001 that I stored yesterday night changed to a 0000000, depending on how I "opened the box". All the hype about quantum computers, talking about what they can and will be able to do, etc. without anyone talking about how they could possibly become practical, even for supercomputers.

Perfect

5:28 Nice refrence.

If you want to get confused instead of seeing an explanation, see this. Sort of

I think Quantum phenomena does happen at the macro level,only slower and less often than the micro level.

I still don't understand how you make a computer with this stuff.

42 xD Can't wait for them!

But it did cover aspects of quantum computing and this is grate as they are rarely covered in pop-science videos. You can not describe the internal how it works in one video as you need some math and there are several physical implementations. Try googleing Quantum computation with trapped ions, NV centres in diamonds, NMR, photons, quantum dots or superconducting qubits for details. Check out youtube channel of Veritasium for some videos of spin qubits.

nice it´s intrinsic inspiring

Bitcoin mining on a Quantum Computer

Nice quantum explanation ...now we need a quantum computer to understand it.

i built a quantum computer and used it to email "happy birthday pal",......it sent the message 'eat my shorts' ahh.....dam that uncertainty principle!

Wow!it is interesting!

That's perhaps the most comfortable voice I've ever heard.

They should be called Schrodinger's Computers. The stages they are in with these computers are equivalent to the 1950's when a "bit" computer took up an entire room and only held a few bits of data. Imagine the world with the coming Internet of Everything along with Quantum Computers going mainstream in the next 30-50 years.

How the hell do I program it then if it could be 1 of 2 things just guess and check?

If there's any "at home" scientists out there feel free to start a discussion :) due to the un-predictability of quantum mechanics, is it finally possible to bring to life the computers of the movie "I, Robot"? where we make software that encompasses the full potential of this randomness by teaching it to generate its own code to improve upon its self? Is the quantum computer a step in this direction or could it be (theoretically) achieved with traditional computers?

.. but we dont use atom super positions in WORKING quantum computers so the part about looking at it or not is not how we actually do it, we use super conductivity, not super poistion, were the current of electricty is flowing freely in all directions like its both a yes and a no going all paths, then raise the metal conductors out fo super conductivity to regular conductivity and make it pick a path once the current has to choose which direction to flow, leaving you with a very good guess path, then do that like 300 times a second to see the most probable answer

The exact way a quantum computer would work cannot be explained, simply because some major points have not been determined yet, such as which physical quantity would be used for the "0" and "1" (addition or not of a charged particle in a system, direction of a "spin", etc.) and near-perfect error correction protocols for large systems. As for the "intrinsic randomness", it differs from a lack of knowledge in the way the object interacts and evolves in time. Bell's inequalities describe it well.

This conversation consists of taking words we are familiar with and using them in ways that sound awesome and sophisticated and claiming that there is some sense behind them. The truth of the matter is that ALL the meaning is contained in the mathematical abstractions. I'm very sure this stuff is very, very simple to understand. It's just that the 'gatekeepers' don't want to break the spell just yet.