How do quantum computers work?

[rosie93]

I've been trying to learn a little bit of quantum computing, but I'm having a hard time understanding the concept of superposition, and how quantum computers use the concept to create more complicated code. For example in a normal computer one bit can be represented by a 1 or 0 at the machine code level, so once you write your code you will use logic such as: if( true or false) ....

How does that apply with quantum computers though? Apparently one quantum bit can be BOTH 0 and 1 at the same time? How does that translate to code?

 

[Baka's Weird Case]

got no clue breh. maybe a smarter poster can help you out

 

[Ethnic Vagina Finder]

I've been trying to learn a little bit of quantum computing, but I'm having a hard time understanding the concept of superposition, and how quantum computers use the concept to create more complicated code. For example in a normal computer one bit can be represented by a 1 or 0 at the machine code level, so once you write your code you will use logic such as: if( true or false) ....

How does that apply with quantum computers though? Apparently one quantum bit can be BOTH 0 and 1 at the same time? How does that translate to code?

All computer code is breh is instructions. That’s it. Quantum computers can simply handle a lot more volume, and complexity of instructions than a normal computer.

or even more simply put, you can tell a quantum computer to do a lot more than you could a normal computer and it will get the job done faster.

 

[Propaganda]

one of the biggest issues with quantum computing (apart from the physical build of course) is the coding. there is no architecture there, no languages that you can work with and build on like in the classical world.

this isn't the best analogy but we've got ps5's and at this point quantum computers are like atari.

 

[rapbeats]

one of the biggest issues with quantum computing (apart from the physical build of course) is the coding. there is no architecture there, no languages that you can work with and build on like in the classical world.

this isn't the best analogy but we've got ps5's and at this point quantum computers are like atari.

lol horrible analogy.

at the moment we have to use classical computers to talk to quantum computers. because thats the only language we know how to use to speak with the quantum computer to ask it to do things.

 

[Take It In Blood]

they been talking about quantum computers since the 80s

i don't know much about them but what I do know is that as of now they don't exist and it's just future talk

 

[Professor Emeritus]

got no clue breh. maybe a smarter poster can help you out

I don't know very much about quantum computers but I'm pretty sure this is the only accurate statement in the discussion so far and even it remains to be seen lol.

 

[Ethnic Vagina Finder]

they been talking about quantum computers since the 80s

i don't know much about them but what I do know is that as of now they don't exist and it's just future talk

 

[Ethnic Vagina Finder]

I've been trying to learn a little bit of quantum computing, but I'm having a hard time understanding the concept of superposition, and how quantum computers use the concept to create more complicated code. For example in a normal computer one bit can be represented by a 1 or 0 at the machine code level, so once you write your code you will use logic such as: if( true or false) ....

How does that apply with quantum computers though? Apparently one quantum bit can be BOTH 0 and 1 at the same time? How does that translate to code?

This video answers all of your questions breh

 

[Serious]

@MMS @Hawaiian Punch help this youngin out

 

[Hawaiian Punch]

@MMS @Hawaiian Punch help this youngin out

Well in a nutshell like OP said computers use bits, 1 and 0. It’s either on or off and computer processes are made by their positions. In the quantum world bits can be both on and off at once. They are called qubits. Or it can be the fuzzy gray area between the two. That’s superposition. Then you get the weird shyt like quantum entanglement, where the position of one of the quibits can somehow influence the position of another quibit at any distance. Those concepts alone are honestly magic, or like Einstein said, “spooky action at a distance”. You could in theory do complex calculations on dna replication and rna synthesis and calculations on the universe that would take a normal computer thousands of years. It truly becomes an unknown with technology like this. We don’t know what we will discover because we don’t have the capacity to discover it. Most likely they will become artificially Intelligent and rule us all. I don’t know.

 

[null]

I've been trying to learn a little bit of quantum computing, but I'm having a hard time understanding the concept of superposition, and how quantum computers use the concept to create more complicated code. For example in a normal computer one bit can be represented by a 1 or 0 at the machine code level, so once you write your code you will use logic such as: if( true or false) ....

How does that apply with quantum computers though? Apparently one quantum bit can be BOTH 0 and 1 at the same time? How does that translate to code?

Good question

Here at some operations that are built into the "OS" of quantum computers.

Quantum logic gate - Wikipedia

These are the equivalent of logical operations on standard computers.

You use these to build algorithms/

There is a list here:

Quantum Algorithm Zoo

How does that help general computing? If you can map your problem to a QC solution you can take advantage of the speedup.

Algorithm:

Transform your original problem to QC inputs

Init qubit(s)

Do calc (without measuring qubit(s)) - use an Oracle function

Measure qubit(s)

Verify (if possible)

Transform to solution of original classic problem

Verify (if cheap - e.g. NP)

By doing your calc in superposition you move the complexity of the solution further up this table.

-

This is a Hello World QC program

How To Solve A Problem With Quantum Computing

This is a good lecture:



-

DWAVE used quantum properties to implement a QC low point landscape function, which could theoretically be used for NP+ hard problems. I'm not sure if they used the above logical QC "instruction set".

-

Like back in the 60's with classical computers, with current QC's you need to understand physics, engineering, math(s) and comp sci

 

[nyknick]

 

[rapbeats]

they been talking about quantum computers since the 80s

i don't know much about them but what I do know is that as of now they don't exist and it's just future talk

and you would be incorrect. they do exist and the future is now. now with that said, they dont know a lot of what they can do yet either.

 

[Ethnic Vagina Finder]

and you would be incorrect. they do exist and the future is now. now with that said, they dont know a lot of what they can do yet either.

They have mastered the technological foundation. But not the practical application.

Honestly, I think it could be dangerous. I don’t think society is ready for quantum computing on a large scale. Or AI for that matter. The majority of mankind is scientifically ignorant.

We creating tools for hunting which were immediately used to kill other humans.

We split the atom and immediately built weapons.


So you won’t be seeing laptops and smartphones with quantum chips in them for a long ass time.