Questions tagged [information]
Add this Tag for questions on information theory applied to physics, especially in the fields of statistical mechanics and thermodynamics, the black hole information paradox, complexity of dynamical and physical systems and questions to do with whether information is conserved by physical systems. Use the tag quantum information if your question is to do with information theoretic concepts applied to quantum states.
626 questions
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Faster than light information: Humans constantly restrict themselves with limits [closed]
If I have two people on the end of a pole 186K meters long, and we both agree pull means "yes" and a push means "no", then we can pass each other information at the speed of light,...
0votes
0answers
80views
Black hole information paradox using Page curve
I'm currently in high school, but I've been following the latest physics research. I was curious about the recent developments in the solution to the Hawking radiation paradox. What exactly is the ...
2votes
2answers
127views
How does writing and erasing memory change entropy?
Picture is from here I think I have serious misunderstanding of the topic, and hope that somebody could point out where the mistakes in my reasoning are. Having looked through many other related posts,...
0votes
0answers
56views
Black hole information paradox non-issue [duplicate]
I'm trying to understand why the black hole information paradox is a paradox at all. Physicists generally agree that information that falls into a black hole is not destroyed because it still exists ...
-3votes
1answer
126views
Does particle INSIDE Event Horizon, carry Information? [closed]
I am not a Physicist but have deep passion about Everything ACTUALLY. I read various places that at event horizon the Quantum Entanglement is broken, one particle goes into event horizon, also a ...
0votes
0answers
49views
Request for Resources on the Ising Model Using Mean-Field Approximation and Information Theory
I’m currently studying the mean-field Ising model in the context of information theory, with a focus on its entropy, free energy, and connections to the Gibbs distribution. In particular, I’m working ...
0votes
2answers
79views
Why is it possible to tell with certainty whether a qubit is disturbed but not whether it is intact?
Consider a qubit ${\mid}\psi\rangle = a{\mid}0\rangle + b{\mid}1\rangle$. Assume we know what $a$ and $b$ are. It then goes through a black box and we want to determine in a single shot whether it was ...
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5votes
0answers
101views
How does Landauer's Principle resolve Maxwell's Demon?
Ok so I'm going to be as clear as I can be in this question which means over-explaining some things that I know most people reading this probably have a pretty good understanding of, just to make ...
1vote
1answer
165views
Understanding entropy and its connection to probability distributions
Entropy tells us about the "uncertainty" of a probability distribution, i.e. roughly how much information is needed to describe an event that is described by a probability distribution. With ...
- 4,500
0votes
2answers
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Have we observed any real-like phenomena faster than the speed of light in vacuum? [duplicate]
A common thought experiment about shadows ask, what would happen if a bat flew across a very, very distant star? The farther the star, the faster its shadow would move, and there's no reason it couldn'...
0votes
0answers
82views
The source of random information in physics
In computer science, we can use the heat of a gas (or radiation, for example) to generate random noise. From them we can get a lot of random information. However, the question arises, where does this ...
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4votes
5answers
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Quantum entanglement explained by non-local hidden variables when photons are not the propagators of information?
I read in WP that the biggest challenge of non-local hidden variables theory supporters in explaining quantum entanglement is: Most advocates of the hidden-variables idea believe that experiments ...
- 4,460
0votes
1answer
36views
Information processing as a resource
Information processing, whereby we convert or construct a representation of information from other information, has now become an essential component to our current world and the future of our society....
- 5,545
10votes
4answers
809views
Is entropy scale-invariant?
The most common definition I’ve heard of entropy in physics is the number of micro-states for a given macro-state. Most examples use the atomic scale as the micro-setting and some kind of simple, ...
1vote
0answers
55views
In the Bekenstein bound, is $E$ and/or $R$ meant to be a strict upper bound or an average? (how to fit with position/momentum uncertainty?)
In the Bekenstein bound, $S\le2\pi R E/\hbar c$, where $E$ is the energy of the system (including mass energy etc.), and $R$ is the radius of a ball containing the system, which of these is strict (if ...
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