How To Make a Quantum Bit

We have looked at how a transistor works, the fundamental unit of classical computers, and how a quantum computer works in theory, taking advantage of quantum superposition to hold exponentially more information than classical computers. Now we look at the practical side of making a quantum bit, or qubit. How do you put it in a state where it is stable? How do you read and write information on it? These processes are described for a solid state qubit - a phosphorous atom in a silicon crystal substrate. Both the electron and the nucleus of the phosphorous atom can be used as qubits.

Thanks to Henry Reich (MinutePhysics) for pushing me to make the explanations and visualizations clearer.

[shipy]

It’s really rare you see a really smart person explain things so clear while he already knows it.

[McMurchie]

I am astounded they were able to measure to that degree of precision a single electrons spin and the Nucleus... mind blown.

[GigaGalacticGamer]

the "bing" gets me every time XD

[Diabolousx]

that guy has a classical crazy scientist accent

[locust]

"So you are watching, on the oscilloscope screen in real time, the measurement of the direction of a single nucleus and our ability to flip it at will every five seconds."

Mind. Blown.

[lee]

"so you are are watching in real time the measurement of the direction of a single nucleus and our ability to flip it at will." That is my favorite part.

[roncho]

8 years and still the best video on youtube i have found about you can make and manipulate a phyisical qubit. Thank you so much man also my cheers to the professor what a brillant man.

[skroot]

Andrea Morello's voice and explanations <3

[VinodkumarGB]

WOW It just amazes me to know human understanding has grown so much! Hope we use it for the good purpose .... one day!

[dowskivisionmagicaloracle]

Hugely educational video, thank you! That Silicon-28 coincidence is an amazing blessing to the Quantum Computing effort!

[TheiLame]

I think i need to watch this video 30 times in order to understand it..

[DrChrisCopeland]

This is one of the best examples ever made on the basics of quantum computing I have seen. Well done, this should be mandatory watching for any info-sec course.

[EberJunior]

Would it be possible for you to release all the video from this experiment that Prof. Morello was doing in the video? The raw video would be fine. I would like to see his whole description of the experiment.

[alonamaloh]

That was really good. Now I need a video that explains how to entangle several of these qubits together, one to explain how to implement quantum gates and one to explain Shor's algorithm. If anyone can make me understand these things, it's you. :)

[larryjohnson]

This dude is awesome! You can tell he’s really into his work and seems like he’d be someone you could really learn from as it appears he enjoys explaining it!

[willytaziou]

Thank you for sharing your passion of science. I've got the same wonderful astonishements about physics, things that do not touch a lot of people like the roundest object on the earth but are somehow so important if you bring the curiosity further. I think you really share the excitement and it is totally linked to your view of education. It's good to see people like you ! 

[InTheBeginningTheUniverseWas]

Analogy for quantum computers; you could say a quantum computer is like a jumbo jet and a normal computer is a car, because a jumbo jet is really expensive, and not something you'd expect to see in every household. but this analogy isn't perfect because a jumbo jet can carry more people than a car (like 50x more), and can go further.
A better analogy is that normal computers are cars, but quantum computers are space shuttles. The quantum computer can take you to space, your car's engine couldn't provide enough energy to take you to space (and obviously cars can't fly). But your space shuttle (quantum computer) isn't good at taking you to the shops, or to your friends house, where as a car is. But also a quantum computer is very expensive and not going to be in everyone's homes.

[GiacomoMilazzo]

At the end of this six movies playlist I've got all I need to understand! Not only about Qubits of course!
YouTube should have a lot of guy like this explaining! Thank you very much!!!

[skfineshriber]

There are so many videos talking about quantum computers, but this is the only one I've found explaining how they work. There are only vague references in other videos about using spin and having 4 bits per qubit, but they never explain the "mechanics" behind it all. Thank you. Thank you. Thank you!

[Yitzhk]

I had no idea there was such a crossover between nuclear magnetic resonance and quantum computing! I just love that science is so much about taking previous breakthroughs and applying them to something completely different