Questions tagged [computer]

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61 views

How does a photonic tensor core work?

There has been much media coverage of the paper Photonic Tensor Cores for Machine Learning: https://www.independent.co.uk/life-style/gadgets-and-tech/news/ai-machine-learning-light-speed-artificial-...
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Computations and physical processes

Can computation be accomplished using any physical process? For simplicity let me restrict myself to the computation of performing addition. I am aware that mechanical calculators just use Newtonian ...
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2answers
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How many parallel processes does a Quantum Computer Have?

I know that quantum computers have a extremely large capacity to do many different calculations at once, but how many different calculations? Is it infinite, like I've heard some articles say, or is ...
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24 views

What are the fundamental limits to the temperature produced by computation?

Wikipedia has a list of limits to computation: https://en.wikipedia.org/wiki/Limits_of_computation These limits seem to mostly be really high bounds based on entropy considerations and so on, but a ...
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2answers
39 views

How can I make sense of the way (screen) colors are generated? [duplicate]

OK here is some common knowledge I have from the net: a computer screen has 3 constituent colors of red, green, blue. To make all spectra of stuffs it just combines them. We also know that red is ...
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1answer
52 views

Is there a common mathematical foundation for quantum and classical computation?

Is there a (natural) formalism that neatly and insightfully includes classical and quantum computation? I have a mostly sound basis in quantum mechanics (as a physics grad), and a much less sound but ...
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1answer
126 views

Resource recommendation for machine learning

I am planing to change my field (in PhD) and learn Machine Learning to differentiate different phases of strongly correlated matter. I learned Monte Carlo method in my MS and have intermediate level ...
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1answer
150 views

Universe simulation

Is it theoretically possible to simulate the universe? I know that some philosophical theories say that our universe is a computer simulation, but is this feasible? Would it ever be possible for a ...
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1answer
162 views

Train Physics Simulation

It's my first time asking here so bear with me. I'm a computer scientist, and I'm working on a train simulator project. I'm having quite a difficult time understanding all the physics and formulas ...
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3answers
49 views

Which system for a quantum computer?

We are aware that we use binary system for our present day digital computers as they comprise of two states (0&1). But what system would fit the states of a quantum computer?
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1answer
46 views

What's wrong with this method of solving NP problems using a quantum computer?

As far as we know, Quantum Computers can not solve arbitrary NP problems in polynomial time. I have what appears to be a solution, but it is obviously to simple to be correct, since otherwise the ...
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435 views

Using a time-like boundary as a computer?

Question and Summary Using classical calculations and the Robin boundary condition I show that one calculate the anti-derivative of a function within time $2X$ (I can compute an integral below) $$\...
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1answer
14 views

What influences the variance of signal transmission speed?

I'm currently thinking about the various sources that influence time when it is synchronized with the NTP protocol. One of them is the physical layer (OSI-model). When sending a bit over a cable, ...
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2answers
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Can we simulate whole universe with infinite size of RAM and modern computer? [duplicate]

If modern computers are universal turing machines and C language is turing complete, theoretically we could calculate and simulate every problem in the universe then theoritically we can simulate ...
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2answers
59 views

Can quantitative model explain away our world? [duplicate]

So, for the sake of argument, let us assume that we have sufficient computational power and brightest scientists. Can we explain/predict every aspect and event of our universe with quantitative model? ...
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1answer
258 views

Quantum computer vs. classical probabilistic computer

Is it possible to make a quantum computer from a perfect random number generator. I'm wondering if anybody that's studied it could make one from that type of random number generator.
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478 views

Supposed we proved that we lived in a simulation. What are some of the current clues we would use to help us acknowledge this? [duplicate]

Suppose that there was a headline in every newspaper that said that science has now proven that we do indeed live in a simulation, without any doubt. Or, some godlike aliens that created our ...
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1answer
65 views

In hard disk drive, what exactly happen when we delete informations from our computer? [closed]

I thought that this question should be asked at some computer/information websites, but since I was researching about physical concepts in hard disk drive, maybe asking here can be a good idea. :P ...
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1answer
65 views

Can a quantum computer implement a classical one?

The normal question about this topic would be: Can a classical computer implement a quantum computer? But now I wonder the exact opposite: can a quantum computer implement a classical one? Can we say ...
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3answers
461 views

Is Physics Computable? [closed]

Is it possible for a Turing machine to simulate physics accurately?   For the problem of reals, I was thinking of the following: For each real, $2^1, 2^2, ...., 2^n, ...$ memory cells store the ...
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1answer
251 views

why are qubits such a game changer in quantum computing? [duplicate]

Qubits are in a superposition which means that they can currently be both digits of 1 and 0 at the same time BUT this is my question: If Qubits have to be filtered to be used then what makes them ...
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1answer
266 views

Modeling the universe as a countably infinite state machine

Could the universe be modeled or thought of in terms of an countably infinite state machine? Philosophically, I am asking from a deterministic perspective. Now, I know that as humans, and beings ...
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0answers
67 views

Did early hard drives lose data from it getting read too many times?

According to wikipedia, early HDD drives used to use an electromagnet to 'write' data on a small region by magnetizing it. I also read in that same article, however, that they also 'read' the data ...
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1answer
196 views

Does “computation” increase entropy?

My computer is blowing heat, and all it's supposed to be doing is sending pulses of voltage through tiny circuits to flip and check the condition of FETs. Ignoring the source of the electricity, I ...
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2answers
73 views

Thought experiment involving Computer in an engineered gravity well

Suppose we have a computer at some location in space within Earth's Orbit. One can look at the all the gravitational forces being exerted on this device (one from the earth, smaller forces from the ...
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1answer
170 views

Quantum decoherence - continuous software, discrete hardware interpretation

Assuming the universe to be a computing machine of some form that executes a specific software program. So far we have reverse engineered the software and it is described by the equations of quantum ...
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1answer
95 views

Do computers contain more information than the information stored in them? [closed]

Computers carry information like graphical, mathematical, musical information, etc. Nevertheless, it seems to me that a computer contains much more information than the kinds of information I ...
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formula for equivalence of number of qubits vs classical computational capability

there are many pop sci articles and press releases wrt quantum computing these days and some may tend to stretch precision in description. one particular area that bothers me at the moment: some ...
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3answers
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Can we simulate the whole universe in computer? [closed]

Here is an idea: As human kind we discovered many laws, formulas, events, etc. in our surrounding environment.here is a way to discover the unknowns : Now if we simulate a virtual world with our ...
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1answer
77 views

Where does electrical power in PC or other electronic devices goes?

I am wondering where does energy goes for example in PC? As I understand part of it definitely changes to the heat and dissipates, but what about rest of the energy? There is no moving parts except ...
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1answer
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If we had a “perfectly efficient” computer and all the energy in the Milky-way available, what number could it count to?

The idea for this question comes from an example in cryptography, where supposedly 256-bit symmetric keys will be enough for all time to come (brute-forcing a 256-bit key is sort-of equivalent to ...
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1answer
122 views

Is it scientifically possible to stop a screens polarization by adding a layer? [closed]

Back story: At work we deal with confidential data, however our desk layout does not allow for screen privacy. We do not a privacy screens and are not allowed to take apart our screens. In searching ...
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1answer
265 views

Simulating the Electric Field inside a Hollow Sphere of Uniform Charge

I've recently been studying Gauss's Law and have come across some results that I want to verify. For one, I am trying to verify that the electric field inside a conductor (in this case it could be ...
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28 views

Data acquisition from Pins ( 5Volt) [closed]

I'm trying to creat a data acquisition system using: computer Geosig ve-53 KPci3101 from the seismic sensor's manual we can see that every pin's output is a 5 volt (or 10?), my question is, how can ...
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0answers
814 views

Dual output logic gates? [closed]

I know with basic logic gates you see in computing, there are two inputs and one output, essentially allowing for one of two outputs, on or off. Does anyone know if dual output logic gates exist or ...
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1answer
87 views

Classical Computation without NOT [closed]

Is it possible to do universal classical computation using bits and 2-bit gates when you cannot perform a NOT operation on a single bit (hence cant do CNOT and so on). If yes, what are the possible ...
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368 views

Computations using light

I recently found out about analog computers. They really intrigue me. I've seen a few videos on how mechanical computers work. I also know that there are electric analog computers too (I have no clue ...
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1answer
195 views

Why does a thermal memory need a thermal bath?

In the article "Thermal Memory: A Storage of Phononic Information Phys. Rev. Lett. 101, 267203 – Published 29 December 2008" it's said that a thermal memory need a thermal bath, similar to a power ...
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1answer
4k views

Would quantum computers be better at everything a GPU normally does? [closed]

I have a very basic understanding of what GPU's and quantum computers are good at. To me, it seems like they overlap, but maybe this isn't completely true. GPU's are good for graphics which requires a ...
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1answer
160 views

Is it true that a processor with a higher temperature uses inevitably more power in comparison with a processor with a lower temperature?

If a processor has a higher temperature, can you be sure it it consumes more power than a processor with a lower temperature? And is the reverse relationship true? A processorchip with a higher mean ...
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4answers
11k views

Why do computers generate heat?

Computers generate heat when they work. Is it a result of information processing or friction (resistance)? Are these just different ways to describe the same thing? Or does some definite part of the ...
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1answer
90 views

Physics in Video Games [closed]

I am a programmer and I want to pursue the Game Design field. From talking to my teachers about it, they said that physics plays a major role. My Question is: How does physics transfer to a virtual ...
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M-Theory and computer simulation

I have a question. Is it possible to perform computer simulations based on the M-Theory? I was looking for such simulators or source codes but I have not found anything. However, M-theory must have ...
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3answers
488 views

Lexical/ontological/semantic knowledge base for physics

Are there lexical/semantic knowledge bases for physics that can be used for automated reasoning and AI (like Princeton's Wordnet and MIT's Conceptnet for common sense English usage)? If not in ...
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4answers
6k views

Is our universe an emulation?

I was watching one of Neil Degrasse Tyson talks and there was a scientist (can't recall his name sorry) who was talking about a recent discovery: "Doubly-even self-dual linear binary error-...
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8answers
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Since cables carry electricity moving at the speed of light, why aren't computer networks much faster?

Why can't cables used for computer networking transfer data really fast, say at the speed of light? I ask this because electricity travels at the speed of light. Take Ethernet cables for example, I ...
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117 views

Nature as a calculator [closed]

I wondered whether physical experiments can find the outcome of otherwise intractable mathematical problems. For example, solitons or other non-perturbative effects in QFT cannot be seen at any ...
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3answers
1k views

How to convert RGB values to physical radiometry and/or photometry quantities and back?

What are RGB values actually mean in physical sense? Are these values mean some amount of light or energy per surface unit or what? Are they logarithmic? Fro example, why do these values are ...
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1answer
296 views

Does the weight of a computer go up as information is added to it? [duplicate]

This probably sounds really naive. But, a strange discussion came up on Quora about computers possibly weighing more when information is added to them. I tried looking around but couldn't find a ...
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Why is it said that without quantum mechanics we would not have modern computers?

I've heard this in many quantum mechanics talks and lectures, nevertheless I don't seem to grasp the idea behind it. What I mean is, at which point is that our modern understanding of quantum ...