Quantum Computers, explained with MKBHD

So, this is it! This. .

. this is a quantum computer? This is a quantum computer!

Here I am seeing a real life quantum  computer for the very first time, with my friend and king of tech YouTube Marques  Brownlee. And I'm finally understanding why quantum computers are such a big deal. "Quantum computers.

. . " "Quantum technology.

. . " "What on earth is a quantum computer?

" "Bits! Qubits! " "Try all the codes at once!

" "Whichever nation first develops a practical quantum computer will have a tremendous advantage. . .

" "Quantum Supremacy. . .

" I see a lot of news about quantum computers and it's always extremely confusing "That was really well done and I still need to re-hear it. . .

" But also it's often wrong. Quantum computers aren't super  computers. They aren't bigger, faster versions of what we use now.

They're something totally  different. And that difference is actually the key to understanding why they're such a big deal, why governments around the world are battling it out to build them the fastest. Quantum computers  are wild.

They're on track to change what we can build and how we understand the world. They're  kept at temperatures colder than space. .

. but if you think you really understand how they work. .

. you're probably wrong. At least, I didn't.

And that's where this video starts. Marques and I both realized  that there was this big important technology that we really didn't understand. So we decided to  go on an adventure to figure out the truth about quantum computers - what they can really do and  why we should care.

And of course we're taking you on that adventure with us, to show you what we  learn as we learn it and more importantly to show you how these crazy computers might actually impact your life. . .

. . .

and sooner than you think. It's a very niche skill we  just got, which is being able to hear when a quantum computer is working. What does it sound like?

Sh-pp-sh-ppp-sh-ppp-sh. . .

[Confused sounds] So it works, it's not broken. I swear  I'm usually good with tech but. .

. The only function of this screen is to  provide directions. .

. you're getting this? So we're going to visit IBM's quantum computer.

This is really exciting that they're letting us see this computer because it is to my knowledge the largest quantum  computer that exists which I say with confidence like I know what that means. . .

I was gonna say, what is "biggest" because like super computers, they're massive rooms full of computers and I when someone says "we have the biggest  supercomputer," I'm like oh I can picture that. The largest quantum computer. .

. I'm not even sure what to picture. I imagine the golden octopus.

. . You know that Biden looked at like [confused].

. . The press images, yeah.

And I know that in order to see that they have to shut down the computer, so this took some real logistics on their part to allow us to see it. . .

This is the real deal. What is most interesting to you about quantum computing? It's definitely on the edge of my  expertise, I would say.

I'm really curious about when it's actually going to touch like regular  people. My whole concern is purchase decisions. at some point in the future quantum computing will  come into play with a real purchase decision.

Someone will have like a device that they can buy where  quantum computing is a part of it or maybe went into its creation at least. When are we going to get to that point? One thing I think is think is very important to make clear is this is a different kind of explainer.

You're just coming with us as we figure this out. Exploratory explainer! Exactly.

A whole new genre. Along for this adventure are Cody and Nicole. Nicole is an associate producer on this episode who is also studying quantum communication for her PhD.

And  Cody is our DP, the man behind the camera. Thank god they're both here. So when I started doing this episode, I spoke to a really famous quantum physicist.

He was really frustrated at the way that  people were talking about quantum computers and I was like, okay, how do you want people to think about them? Okay, here's the analogy that helps me understand what quantum computers are good for: Imagine that you're on a video game map and how you get around depends on how good you are at doing math. .

. (You may not want to play this video game, bear with me. .

. ) So first there were no computers.  Things like geometry and astronomy took forever.

So you have your little pencil and paper and you're  traveling across the mathematical map by walking. It was slow and there were lots of areas that  we just couldn't explore because it was beyond our computational ability. But then we developed early  computers, and that allowed us to input larger data sets and answer problems that had previously  been out of reach.

These new computers unlocked new areas on our mathematical map. Instead of  walking everywhere we can now ride horses. We can get farther faster and we can access areas  that were previously inaccessible.

But there were still parts of the map that our computers couldn't  access. Luckily, computers just kept getting better and they allowed us to solve more and more complex  math problems. As a result, our virtual map has transformed: We have roads and cars and we're just  reaching areas that were previously unreachable.

Better computers mean traveling across this map  faster and more easily than ever. The thing that he said was really important to understand is that  quantum computers are not faster cars. They're BOATS.

A boat is not necessarily better than a car,  they're just built for totally different terrain. So with our new quantum computers, we're beginning  to navigate these new mathematical waters, solving problems and discovering areas that traditional  computers just can't. My question for IBM is: What's in the water?

Oh wow. . .

Like, what are the oceans that we're all of a sudden able to explore with our quantum computer-boats? I love this. I'm an analogy person, so I'm like fully absorbed in this now.

This is why I think a quantum computer  is never gonna "beat" an iPhone. But I think that this is a better thing to offer the audience,  like to offer you guys instead of like "quantum computers or just another exciting computer. " I guess what people are probably clicking on this video are thinking in their head is, "well is there  really never ever be a quantum computer in my pocket?

" And I guess that would be, "will there ever be a flying car-boat? " You know, is the tech ever going to get to that point? I just want to say I really appreciate your commitment to this analogy.

I love it. I love the analogy. Guys, we have arrived.

. . .

where we have arrived to. . .

This does not look like there's a quantum computer here. IBM Research Division. .

. Here we go. Okay before we get to IBM, I want to show you  something: So I travel a lot for Huge If True episodes.

I went to Spain recently to visit behind  the scenes at Formula E testing which was really really fun. But often when I travel I want to make  my computer believe that I'm still in the United States. Just so that everything online feels  normal to me: the websites that I visit are in dollars, the TV shows that I like never get blocked,  that kind of thing.

The way to do that is with a "virtual private network" or VPN. Specifically, this  one: Surfshark. If I'm using Surfshark and I set it to the United States, I can be at home online  even when I'm traveling, which is really nice.

But sometimes I want the opposite: I want my computer  to think that I'm somewhere else when I'm actually at home. You might not realize that a lot of  things (like airline flights especially) are priced differently depending on where they think you are  when you're buying them, which. .

. GRRRR. But also you don't have to put up with that.

When I use Surfshark, I can set my location to one of 100 different countries and then hopefully spend less. If you  don't already use a VPN, you might find it useful. I know I do.

If you want to try it out, click the link  in my description and use the code "CLEO" for 83% off and three months free, which is just a crazy good  deal. I think you'll probably like it but if you don't they offer a 30-day money-back guarantee.  So go check them out.

Now back to the story. . .

Alright. . .

Let's go! Let's go see a quantum computer. We made it, we're here.

Here we go. Do you want to introduce yourself first? Olivia, audience.

Audience, Olivia. Hi! I'm Olivia Lanes.

I'm a researcher at IBM and  I also work on the education and the community team. We're gonna  go look for a quantum computer. What's goin' on here?

This is our Watson setup. . .

no please go ahead. . .

this is where the Watson AI was displayed and it competed on Jeopardy with Ken Jennings. . .

"Watson? " "What is shoe? " "You are right!

" This is Brent. It's Brent's lab, so it's very nice of him to. .

. Great to meet you. Thanks for having us!

So this is the lab. . .

That's a quantum computer? Yeah. Actually, this is a dilution refrigerator.

This whole thing is basically constructed to  keep the quantum computer very very cold: 15 millikelvin. It's the coldest thing basically  in the universe. It's colder than outer space.

So inside that is 15 millikelvin? Yep. [That is very cold] So here, let me show you the one that we can like play with.

. . This is it.

. . This.

. . this is a quantum computer.

This is a quantum computer. [Ohhhh yeahhhh] The quantum computer is a chip in this one here but this whole thing keeps the quantum computer working at insanely cold temperatures like we talked about. So this is all refrigerator technology?

All of these cables that you see here on the side carry signals down through the fridge into the processor and then they do their their quantum stuff and it comes  up and it goes to these room temperature control electronics and they turn it into things that humans can understand. That is a quantum computer. We were allowed to touch it which was cool.

Oh my god. . .

So I think it's really funny that when people generally talk about like the difference between  classical and quantum computers people are like "okay well you know how a classical computer  works, right? " but like the truth is that like nobody knows that. A simplification  of it is it comes down to bits.

[BITS] and bits are made out of pieces of silicon and  you have you know tens of thousands to millions of them in your computer. And they can either be in  the state zero or one. We call it the ground state or the excited state.

And everything that you type  into your computer, all words, all numbers, all colors, get translated into computer speech. But  it's very binary, right. A quantum computer is run on qubits.

Qubits aren't like bits. They aren't a  one or a zero. They're more complex.

Think of this like a wave: A qubit could be really likely to be  zero which means a lower energy wave. Or it could be really likely to be one which means a higher  energy wave and each qubit has a probability of being each. When a quantum computer is working,  the probabilities of multiple qubits interact.

And they add constructively or destructively just like waves would if you were to tap two places in a pond. . .

You know how when you explain something to a two-year-old and they just keep going "why? " and you have to  explain again and they go "why? ".

. . my question is: As the controller of the computer,  you decide what about those probabilities?

Basically, you are altering the probabilities while you're running an algorithm. . .

It's a common misconception that quantum computers "try all the options. " That's not right. This is simplified but it's more like a quantum computer kind of watches the pond.

. . it watches how all of those waves interact and then finds the most likely answer.

If this is  all confusing, don't worry, all you really need to know is that quantum computers calculate things  very differently than classical computers do and that makes them good at different things. Quantum computers are not going to be faster at everything than a classical computer. Like, it's not good for  addition right, because your calculator and your phone is perfectly good at that.

But the things  that quantum computers are good at is finding structure in tons of data. And if you're interested  we can close it back up. .

. Absolutely. Put us to work.

Let's go back to our virtual map: So we have our boats, and we're floating around  discovering new parts of this map. One of the first new areas of interest is "simulating nature. " Simulation of nature seems really interesting.

Why is nature one of the things? So nature fundamentally is quantum and it obeys quantum physics. We just don't normally see it but if you  look at like a molecular level and like the atomic structure of molecules, everything has to follow  the laws of quantum physics.

It's really hard to calculate what a material or what an atom is  going to do a certain size. So at a certain point it just can't do it. But if you're interested in  like developing battery technology or creating new materials that have you know long chains of  molecules, you're going to need a quantum computer.

This is why people are so excited! Think of the  new materials or medicines or molecules that we could make if we could better predict the  way that nature behaves at a molecular scale. There you go!

Boom. Okay so simulating nature is something that quantum computers could be amazing at but we're also getting  closer to another use for quantum computing, one that people and governments are more concerned about. .

. "Completely new encryption algorithms" "Break encryption. .

. " "Quantum resistant encryption. .

. " "A fully functional quantum computer could be built with code breaking capabilities that could render all forms of online encryption unreliable. .

. " Okay now this is the one that I've been waiting to ask about: why is everybody so obsessed with talking about  quantum computers and encryption? So the first major algorithm that was developed for quantum computers is Shores Algorithm, named after Peter Shore, super nice guy.

He invented an algorithm  which basically can find factors, prime factors, for really large numbers. Why does anyone care about  this? Because that's the basis for "RSA encryption" which is basically how all transactions on the  internet are conducted and the entire reason that all of our encryption schemes today work that  way is because it's basically impossible to crack that with a brute force classical algorithm.

It would take I think it's like billions of years. But a quantum computer could do that way  more efficiently, we're talking hours to days. So this global race now makes a ton of sense.

Whoever gets a quantum computer to actually do this has a big, obvious advantage. But we haven't done that yet. That's one of the ones that requires probably like a million qubits or more to do, but we're working up to it.

So we're not going to be using quantum computers to break all internet security right now. Today, we're at 433 qubits, the record set by IBM. 400 to a million qubits is a big difference but Olivia is confident that we'll get there sooner than you think.

In the next five or even  less years, we're going to see people switching over to quantum safe algorithms because of this reason. So RSA goes away and we have quantum safe encryption instead? Probably.

Not all at once  yeah but gradually you're going to see people do it. We're progressing at an incredibly fast  rate. We're solving problems that people didn't even begin to know how to crack two years ago.

But  we've done it! Every single year, everything that we say we do, we do. Nothing mathematically  or physically prevents it.

And so if the physics says it's allowed, the engineers will find a way. That's sick. I'm picturing that - I'm adjusting the analogy slightly that it's a "submarine" because  there are sort of different levels of quantum computing.

. . Yeah, we are just skimming the surface.

We're going to keep iterating and improving upon this technology every single year and  we're probably going to discover like new applications that we haven't even considered yet. It's a bottomless ocean. .

. It's a bottomless ocean! The tour was amazing and as we left we thought about what we learned: Awesome.

Let me just get on the highway and then I will have thoughts. . .

Quantum computers do look exactly like I  imagined they look! They look like the pictures. But something about being  in person with it was just like, oh.

. . helped me understand that this is a fundamentally different  technology.

Like it just looks so weird. I'm really glad I got to finish exploring that analogy  and fully understand it too and adjust it a little bit to like a really encapsulate at  least everything that I currently understand about quantum computers, in that there is an  evolution to the future of them and that they are specialized and really good at certain things. I like a good analogy so that helped a lot.

Okay so what is your summary of the analogy now? I think we can keep almost all of it which is that our exploration of other fields of mathematics  and physics and science was equivalent to other steadily advancing forms of transportation  around our imaginary video game island but I like adjusting to "submarine" because there are  levels to it. It's more of a bottomless ocean in that we're just going to keep going!

The tech  gets better, there's no physical limit. It just continues to improve. Here's how Olivia put the dream of how we'd actually use quantum computers: It's beautiful because like of course  we all want to make the world a better place, we want to develop technology that's going to  enable us to do fundamentally different and better things.

But it's also beautiful because  like part of the human experience is you just want to learn what we are and like learn  more about the world we live in. And the fact is: The world is quantum mechanical. There you have it!

Thanks for coming. Peace! This episode was so much fun to make.

Huge If True is a genuinely  optimistic, journalistically rigorous show about finding ways to use technology to make the world  better. If that's something that you believe in, the best thing that you can do to support us is  to subscribe. And if you like this episode you definitely should subscribe because Marques and  I already have another adventure planned.

Also if you subscribe leave a comment and let me know.  I'd love to meet you. See you for the next one!