# Questions tagged [computer]

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### Why can't we search string vacua by computer?

I am imagining this: A database of Calabi-Yau manifolds. More can be added when more are found. The software picks a random CY manifold, assigns random fluxes etc. It looks at the low energy sector ...
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### Why are computers much smaller than they are fast?

In any medium there is a finite propagation speed at which information can spread. Special relativity provides an upper bound to that propagation speed, namely the speed of light in vacuum. Signals of ...
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### How to calculate Distance $D$ to object from a camera with known $H$?

I am using algorithm to draw a bounding box around object when they appear in camera as shown in attached image. The main confusion is that i consider the object closer to camera when the Distance $D$ ...
225 views

### Can (and should) wifi internet be considered a force? [closed]

I've recently been using my wifi internet, for the last few years and have been enjoying it very much. I am able to communicate with my family across the globe in mere seconds, it's obviously a marvel ...
66 views

### Is there a computing process heavily dependent on the principles of gravity? [closed]

Most of the current and future computing technology depends on the application of physics of subatomic entities (electrodynamics and quantum mechanics). Since we haven't explored the gravitational ...
120 views

### Does a CPU do work?

This question is simple to the Core (excuse the pun). CPU = Central Processing Unit (for computing) Lots of people including myself say "My CPU is doing a lot of work." But I do not think ...
235 views

### Why do LCD pixels at the very edges of the screen "disappear" when looking at a shallow angle?

I've noticed something curious about my LCD screens (one of them is a TUF VG32VQ1B and the other an AOC I2269VW, if it makes a difference): If I look at them at a shallow angle, any bright line of ...
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### Computers, quantum information and computational complexity in Kerr-AdS black hole backgrounds

A Kerr-AdS black hole is eternal, never evaporates and has a Malament-Hogarth metric. Bob, a universally programmable reversible classical computer with a fixed maximum memory who only outputs one ...
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### Can artificial neural networks be effective theories?

Wikipedia describes "effective theories" as follows. In science, an effective theory is a scientific theory which proposes to describe a certain set of observations, but explicitly without ...
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### Do all physical processes necessarily imply a computation is taking place? [closed]

I would like to understand if any and all physical processes taking place, necessarily imply computations are also taking place. As a motivating scenario for the question, consider the following: ...
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### Informational content of a single symbol

In the communication context, every book i've started to read says: if you want to send a datum about a random experiment $X$, let it be a fair coin toss, that is $$p(tails)=p=0.5; p(heads)=q=0.5$$ ...
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### Computer analogy to non-locality in quantum mechanics

It is not uncommon to say that the non-locality of quantum mechanics is equivalent to the following computer analogy: if you are trying to model an entangled two spin system, then even if the spins ...
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### Computers That Can Compute in Femtoseconds

I was watching a video about LCLS 2 and they mentioned that they can shoot and record up to 1 million x-ray pulses allowing them to see chemical reactions. They said that these pulses of x-ray last ...
161 views

### What are the technological limitations of DNA computing? [closed]

IBM and Microsoft are studying the application of DNA computing, but I was wondering what are the technological limitations that prevent it from being used in the same way as a conventional digital ...
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1 vote
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### Do laptops become slow due to the second law of thermodynamics? Is it inevitable that classical or quantum computers will get slower over time? [closed]

The large scale composition of solid devices which comprise the hardware structure of modern computers are subject to the second law of thermodynamics as are all other physical objects. Assuming the ...
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### Does uncopying an information requires a copy of the same program in this scheme? If so, how?

In the paper Information is Physical by Rolf Landauer (reference), it is claimed that Uncopying is not equivalent to erasure and, just like copying, can be done with a dissipation per step ...
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### What makes a Quantum Computer Faster for solving specific problems?

I have an undergraduate understanding of Quantum Mechanics (or at least of whatever is covered in Griffith's) and the idea of a Quantum Computer sounds really interesting but I am having some trouble ...
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### How can the universe be a computation?

A few physicists (or computer scientists) take it for granted that the universe is a computation. However, I am not able to understand how the universe CAN be a computation in the first place. I come ...
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### Could the world be represented as binary? [duplicate]

The Matrix the movie regards the whole world as being binary and us living in a computer simulation. Could the world be represented as binary similar to a matrix or is that not practical give quantum ...
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### Are quantum computers able to simulate every physical process that a classical one can simulate?

I edited the question since this comment was (rightly) made: There are few things that are more annoying than questions where the question text is not self-contained. So: Quantum supremacy has been ...
290 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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1 vote
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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 ...
675 views

### 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 ...
32 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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### 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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### 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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### Resource recommendation for machine learning

I am planning 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 ...
306 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 ...
339 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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### 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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### 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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### 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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### 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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### 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 ...
60 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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### 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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### 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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### 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 ...
1 vote
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### 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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### 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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### 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 ...
439 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 ...
71 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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### 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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### 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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### 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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### 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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### 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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