# How Does a Quantum Computer Work?

How Does a Quantum Computer Work?

For more on spin, check out: http://youtu.be/v1_-LsQLwkA

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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.

Thank you to Andrea Morello and UNSW. For more info, check out: http://bit.ly/17wZ7lt

I lost him when he uttered the first letter “A”……

So Qbits can store & process more data in less steps cuz they are exponentially more efficient – compared to classic cpu bits? (When scenario calls for benefit of quantum superposition – like running enormous algorithms??)

Top explanation even for me as physisist !!!

I still dont understand how normal pc work…i mean i enter my name and how it can know from 0 1 what is what

Thanku sir, it was very informative

Thanks for this easy and at the same time deeply explanation !

Does brain work like a quatum computer?

Damn that chest hair

So then what sorts of tasks exactly would a quantum computer have an advantage in performing?

This Prof. Morelo has a QC playlists here: https://www.youtube.com/playlist?list=PLHSIfioizVW2uC27IFkHlSc-NgvZjBliZ

And

https://www.youtube.com/playlist?list=PLqSkUknJX0S9olTYuJ5SOl1D6pbzaPuWx

Does your quantum computer come with Windows preinstalled?

I guess my mind is a classical bit, because it only exists in the state of not understanding this.

This is my research, (1.5 state)

It’s actually a solution that scientists are seeking for the NP problems…

Please tell me whether the point below is correct or not.

If there are 2^n bits to be processed, the classical computer is supposed to process it one by one, thereby making it impossible for it to do a scale of calculation where n=300+. But in the Quantum computer, it processes the whole 2^n bits in one go. That’s why the processing time is way shorter? Isn’t this true? In theory of course, but isn’t this the case?

it all boils down to "42"

3.45 , he was so proud of his statement !

Basic terms explained

Great video 👍

I think this is what I’ve been looking for

If I understand this correctly; quantum computing isn’t about how fast you can send a normal command, it’s about how efficiently a large command can be sent, resulting in the equivalent of multiple traditional commands being sent in one quantum command?

I think I’m even more confused because I tried to make sense of this but hey, you can’t have quantum computing/mechanics/physics without first having more aneurysms than you do blood vessels am I right?

I make money changing words on Wikipedia and travelling to proposed creators of inventions.

Qubits are like Epstein.

Someone suicided him.

You said magnetic field is spin but in neutrons is there magnetic field or spin?

So a 300 qubit computer could simulate more than the number of particles in the universe! So is that what we are in….just running in some simulation until they get it right? And, BTW, who are "!they"?

Does being in different states at the same time require a visa?

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!

That’s such a backwards way of explaining quantum computers… We should first start with stating the problems we are trying to solve and why the classical computers fail. Trying to solve the Shrodinger’s equation for an atom more complicated than a hydrogen atom – you have to track interaction between so many quarks and electrons that the time complexity of the algorithm solving the equation grows as O(n!) where n is the number of quantum particles in the system. 20! is already such a big number that it takes months for the equation to be solved, and 100! is simply impossible – even if you set all of the computers available at the beginning of the time they will fail to compute the position and the energy of a quantum system consisting of 100 quantum particles. So here enters quantum computer or a quantum simulator where you have these particles available to you directly so you can manipulate them, put them in certain state, then let them interact and then directly measure their state instead of simulating it with a classical computer. How do you go from tinkering with Q-bits to simulating real world quantum systems – enter quantum algorithms which essentially make the translation to and from Q-bits interaction to real world quantum system interaction. So that ladies and gentlemen is the quantum computer and the very reason it exists.

Finally!!! I get it!!! Prof. Morello’s explanation is simple and elegant. Thank you! 🙂

Best explanation ever!

When you get it working let me know.

Please tell me

So ot kinda sounds like quantum computing is better run on common core math rather than english math

Normal computers works on Transistors / quantum computer works ion electrons outerside of atom

I found the answer to Quantum Computing: 01010100 01101000 01100101 00100000 01100001 01101110 01110011 01110111 01100101 01110010 00100000 01101001 01110011 00100000 00110100 00110010

For some strange reason I understood everything he was saying.

Camera person pissed?

Most important thing said was near the end, where prof said for most common applications now, like surfing internet, or word processing, quantum computer would be slower, so its not a replacement for classical computers. But, that is now…..

Thank you for the bad explanation

why electron spin down for the lowest energy state? I thought it should spin up when it aligns with the magnetic field.

0:42 – опааа, Джайро одобряет, тупа ньюююхо, шо

i am having trouble seeing the difference. the amount different states for a normal processor is already 2^n, the explanation of Qbits here seems to just repeat that.

Are all intelligent people left handed?😂

53 qbit google computer (and 1 dud)

9,007,199,254,740,992 calculations.

Answer found in 200 seconds.

Classical computing would take 10,000 years.

"How do we know that is the right answer?" – "It must be."

Are we taking a test after this video?

If i had two electrons having any of the 4 combinations and named each combination a,b,c and d respectively, then does "superposition of each one of these 4 states" mean that a, b, c and d will superimpose or that , lets say in d, the two spins could superimpose?

That’s nice. Every video says the same things.

BUT… How do you:

1. Input data

2. Output data

3. How the heck does the "computing" work?

Is there some sort of Program that needs to be written.? Or is it some magical thing that can’t be explained?

Does it work something like a OUIJA Board?

Elon Musk and Gordie Rose mention "an alter to an alien god". Is this somehow connected to the Matrix or Universal Consciousness?

What David Wilcox calls the "Source Field"?

Similar to what savants are connecting to?

What are they NOT telling us about this "alien god"?

My best guess is that it works like an OUIJA board but connected to a much higher level of consciousness and not just the lower astral demons. I would assume you "talk" to this "alien god in ASCII and the output is in ASCII and it most likely would understand different languages since it has no "program" as conventional computers do.

If you understand how the lowest level of machine code works, you must realize that this is something very outside the "normal" physics of conventional computers. It’s magic! Possibly metaphysical in nature.

Is "alien god" just a metaphor, or is it to be taken literally?

What exactly is artificial intelligence?

And why are they not telling us?

So basically in quantum computer’s processors are particles in superposition, but when measured they give you one stare or another?

Thank you for explaining quantum computing in another way, which I also do not understand. It would be helpful if this were brought this into the real world by describing what is physically measured, what it is measured by, what the readout is, how this measurement is done, and why these measurements allow processed that are exponentially faster, to be measured. Is that too basic or boring for you? Will it mean that you won’t be able to use the term quantum entanglement for a short time?

0:11 It is NOT 0 and 1 at the same time. It is 0 or 1, but we can not say which one because it alternates its state rapidly.

Using the left hand means very smart

I believe these guys, but sometimes I wonder if they’re just punking us because most of us (me for sure) don’t know enough to question it.