/sci/ - Science & Math » Thread #12256970

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Anonymous Wed 21 Oct 16:56:21 2020 No.12256970 View Reply Original Report

Quoted By: >>12258791

Would it be accurate to say while regular computing uses logic based on binary 1s and 0s, quantum computing is akin to using the infinite array of values(0.1,0.57,etc) between 1 and 0 or is that inaccurate even for an extreme oversimplification?

Anonymous

Anonymous Wed 21 Oct 2020 17:13:29 No.12257026 Report

Quoted By: >>12257031 >>12258791

In a way but you're not doing it justice. What's meant with 0.1 is that you have 90% chance of measuring 0 and a 10% chance of measuring measuring 1 if you were to measure the state right at that point. The actual qubit is in a superposition between the two.
No one (that I know of anyway) describes a state like that because it scales very poorly to multiple qubit systems where you just want to see what final states the system can collapse to at any given point, and yours will be very confusing even with a 2 qubit system
(For example, does $\ket{0.5,0.5}$ mean $\ket{11} + \ket{00}$ or $\ket{10} + \ket{01}$ ? It could also mean the full superposition of all possible states)

Anonymous

Anonymous Wed 21 Oct 2020 17:14:32 No.12257031 Report

Quoted By: >>12258734 >>12261774

>>12257026
Well fuck me and here I was thinking this board had latex integration or the sort. Guess that'll teach me for not actually double checking the documentation.

Anonymous

Anonymous Thu 22 Oct 2020 01:53:15 No.12258719 Report

Quoted By:

>pretty much one of the only non-popsci threads
page 9

Anonymous

Anonymous Thu 22 Oct 2020 01:59:19 No.12258734 Report

Quoted By: >>12261774

>>12257031
you gotta enclose things with $~~~~~$

Anonymous

Anonymous Thu 22 Oct 2020 02:34:27 No.12258791 Report

Quoted By: >>12260897

>>12256970
that's more analog electronics. What >>12257026 said is more than I can provide, which would be the dumbed-down version: that it could include 1,0,both, including various probabilities of "both" being 1 or 0. How this would translate to an analogue of assembly boggles the mind of lesser beings such as myself, but it sure is interesting. Redundant post but mainly intended to bump a worthwhile thread

Anonymous

Anonymous Thu 22 Oct 2020 18:14:35 No.12260897 Report

Quoted By: >>12261542

>>12258791
Yeah it’s worth a bump but it will die quick because none of these pseuds on this board actually know shit
I work in a related field (developing the materials for quantum computers, but not the computational protocols) but one guy described it to me that the power of jt is really that there can be multiple algorithms running at once in the x, y, and z axii (or some other orthogonal basis). Look up hadamard gates
I’ve always thought of it as being somewhat like OP describes though. Yes it’s actually the probability (or weighting of the ket superpositions) but it’s essentially the same shit imo (could be wrong about this tho)

Anonymous

Anonymous Thu 22 Oct 2020 19:59:41 No.12261223 Report

Quoted By:

As we measure a state, we obtain an eigenvalue of the observable so it's quantified. I am not sure quantum computing uses law of large number to measure probabilities and compute this as an analog device

Anonymous

Anonymous Thu 22 Oct 2020 21:48:09 No.12261542 Report

Quoted By:

>>12260897
Alright so after doing some googling around it seems like the heart of the issue is the ability to perform fourier transforms quickly. Since classical computers work on voltage bits and send it around some fuckhuge series of flipflops and registers in order to compute the output, qubits are able to fourier transform themselves “naturally” by just a change of basis
at least that’s my off-the-top-of-my-head spitballing

Anonymous

Anonymous Thu 22 Oct 2020 22:36:42 No.12261727 Report

Quoted By: >>12261793

Think of it this way:
Vectors in R^2 have an x-ness and a y-ness, expressed by their components in those directing. Now let those directions represent computational 0 and 1. Then every vector has a 0-ness and a 1-ness. Less last ingredient is restricting vector lengths to 1,so that vectors all lie on a circle around the origin. That's it.

Anonymous

Anonymous Thu 22 Oct 2020 22:47:33 No.12261774 Report

Quoted By:

>>12258734
lmao

>>12257031
click the tex button in the top left of the quick reply window

Anonymous

Anonymous Thu 22 Oct 2020 22:52:47 No.12261793 Report

Quoted By: >>12261844

>>12261727
brev all you did was describe a normalized ket composed of two orthogonal eigenkets kek

Anonymous

Anonymous Thu 22 Oct 2020 23:08:38 No.12261844 Report

Quoted By:

>>12261793
Yes. That's the point. It's not all the values between 0 and 1, as OP implied, it's a vector in 2D.
Congratulations on your reading skills.

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