Quantum Instruction Set - Computerphile

Just what can you do with a quantum computer? Robert Smith of Rigetti Computing takes us through his quantum instruction set.

This video was filmed and edited by Sean Riley.

[FlesHBoX]

It feels so weird understanding everything being said, and still being clueless how the subject matter actually works...

[colox]

i'd love a video where he starts by explaining the 5 operations in detail and then gives a bunch of example problems with the relative codes to solve them

[dhess]

These ‘Quantum + Robert Smith’ videos are some of the best content I’ve ever seen on YouTube. Well spoken, clear, in-depth explanations, makes a complicated topic easy to follow.

[WofWca]

14:12 it’s like he’s trying to skip an NPC dialogue.

[jakejakeboom]

High level non-technical explanation of quantum computing: it's an analog computer at the quantum scale. Classical analog computers are essentially a tool to model a problem (like calculating a trajectory) by mapping it to a physical (electronic circuit) equivalent. If that mapping is done well, then physics does everything for you in constant time pretty much. The advantages of quantum computing are the density of information and complex quantum properties. However, this also comes with the caveat of being much less intuitive than classical analog computing.

[OceanBagel]

"How many instructions are there?"

"Infinity!"

"..."

"Just kidding, there are five."

[sinekonata]

This is the first time I get so many solid answers to my myriad of questions on the subject. And it's not for lack of trying, this person is beyond amazing at teaching. I love him so much, I'll try following him from now on.

[ouiVEVO]

extra bits should have been called extra qbits

[janpokorny]

Could you show some short program and explain what it exactly does. I am just turning my head around this.

[Ojisan]

This video would benefit from an example use case for a quantum computation.

Do the Fourier quantum transform and compare the number of steps to a classical approach.

[nikoerforderlich]

I would now love to see an explanation of how we can compute something useful with these instructions. Maybe an example?
Because I think I understand the basic workings so far, but I can't yet see how to do anything useful with it.

[maximkazhenkov]

This video was more illuminating than all the pop-sci articles and presentations about quantum computing in the world.
Thank you!

[sumdumbmick]

I like how he keeps saying, 'the details don't matter' but he keeps mentioning them anyway, and 'it sounds complicated but it's not' when he's the one saying it in a needlessly complicated way.

[janjager]

This is the first time I got a “mental” image of how these computations work and why it this is such a leap in computing. Thanks.

[alcyonecrucis]

I think the last part really saved it. I finally understand a little. Thanks computer phile!

[MrMcCoyD]

I think what wasn’t described that well here which leaves a lot of people confused is how data is input to a quantum program. It depends on the program itself, but you could imagine setting up the initial probability table with the input data. Or have an incremental algorithm where you input probabilities into a couple qubits, then somehow integrate that into the rest of the quantum state, over and over.

[Android]

I would love more on this topic. This guy is a great presenter.

[rubenarth]

Wow, his explanations were so clear and evident, it really blew my mind a few times. 🤩🤯
2 to the power of 250 qubits, doing a matrix multiplication in 50 nanoseconds...what.
It's like they operate as one system, no matter how many you have.

[Deeharok]

I'm a bit confused on how this can actually be used to solve problems.

[frognik]

This video should have been the main video.