How Does a Quantum Computer Work?

A quantum computer works in a totally different way from a classical computer. Quantum bits or 'qubits' can exist in a superposition state of both zero and one simultaneously. This means that a set of two qubits can be in a superposition of four states, which therefore require four numbers to uniquely identify the state. So the amount of information stored in N qubits is two to the power of N classical bits.

[LeSuperModeste]

Wasn't expecting Loki to do an explanation about quantum computing

[BM-jycb]

That's the first time I've 'got' how quantum computers work. -'it's not the speed of the individual operations, it's the number of operations it takes to reach the result.' No magic. Andrea is a superb scientist. I love his explanations. Thank you!

[silvertakana]

Classical computer: true, false

Quantum computer: maybe

[Misayah]

Really like how this professor teaches. He's very understandable.

[jassging]

it's amazing I don't even understand a single bit.

[borhanzadeh]

Epic accent: Check
Epic hair: check
Epic soul patch: check

This dude's got it down

[dkrIlI]

almost 8 years since the video was made and i still think this is one of the best explanations i can find for my tiny brain to comprehend the basic definition of quantum computing.

[xuanyuquah]

I lost it at the when he started explaining about the coefficient part

[deepmeyt]

The comments section:

100% : I don't understand
100% : I understand




.. And that's quantum computing

[robertbohrer]

Yes, but how does the computer *actually* work? How does it store a qubit? How does it entangle the qubits? How does it read the basis state? How is he algorithm strucured?

[cretinousswine]

This video should be titled “Italian Metalhead Explains About Qubits”

[braker]

02:33 - the moment he realized the average viewer won't understand anything. And he was correct.

[Brandonakahk]

I have what scientists call QI or Quantum Intelligence, which exists in two states, before you measure it, I am both Intelligent and not, but once you measure it, what you find is that I am not intelligent 99% of the time. By the way, I don't even understand this enough to make an appropriate metaphor, and this is the 1% trying it's hardest here.

[LuLu-fxit]

When you accept to wear in a big red atom disguise, that's the moment when we know you're truely dedicated to you channel!

[subzeroelectronics]

Finally someone actually explained how they work! I’ve know for years about how, “it’s nothing like a classical computer, it can have bits in superposition” but no one told me how to read the qbits or how they interact.

[gauthierlechevalier]

For those wandering, why when you add up the coefficients in front of the possible states of the electron spin at 1:35 you don’t find one (which would mean he made an error in the probabilities) , it’s because these numbers are just coefficients, if you want to get the actual probability of getting an electron spin up/down, you have to square the coefficients:
(0, 80)^2 = 0, 64
(0, 60)^2 = 0, 36

And when you sum up these numbers you get one.

[debajyotisg]

Andrea Morello is my new hero.
Explains things so nicely!

[Bazzabazeman]

Tha guy's accent, it's legendary.

[helmutalexanderrubiowilson]

professor Morello is amazing he can explain this complex concepts so easily... the rockstar of Physics

[kazj]

I remember my physics professor at Georgia Tech was building a quantum computer back in the early 2000’s, but it was probably a 2^1 or 2*2 Qbits at that point, 😂. Smarter than I’ll ever be!