Information Definition and 999 Threads

There are irreversible logic gates, are there not? Gates who's outputs don't preserve information about their inputs, no? Or take for example computer parts that crunch numbers. If you know the answer to a calculation is 12 but that's all you know, then you can't figure out whether the...

What happens to the information about the objects falling into the black hole? Are their states somehow contained in the Hawking Radiation, and if so, how? Or is the information scrambled as it passes the EH?

I know there is a modern paradigm that states that nothing, including information, can travel faster than the speed of light. (With exception to quantum entanglement, but I'm not going to pretend like I know the exact details of that subject). Thought experiment. Imagine there are a series...

Hey! :o Suppose we have the function $f=\sqrt{x_1}x_2$, with $x_1, x_2>0$. I want to say something about the intercection of a vertival plane through the graph of the above function. To find the intersection I have done the following: Setting $x_2=1$, we get $y=\sqrt{x_1}$ for the...

Does the electron field has information about its charge(strength) throughout space and if not why not? I hope this question is not vague.

I'm trying to calculate a Wigner Function of an entangled state, and I'm not quite sure how to proceed. I have created this state by sending in vacuum and a squeezed state into a 50/50 BS, where the output state has a density operator: $$\rho_{34}=S_{3}S_{4}S_{34}|00\rangle_{34}\langle...

They say that the universe started with low entropy, which is a certain amount of information. But I wonder how the information associated with the whole universe can change. By definition nothing can ever leaves or enters the universe as a whole. And if nothing ever enters or leaves a system...

Hey all! I'm a junior undergrad and am beginning to think about what graduate programs I would like to apply to next fall. Recently I've been doing theoretical research in quantum computing which I'm really enjoying. I'm pretty sure that this is the sort of research I would like to pursue in...

Hello friends, how are you ? Today's question is: How do i choose the data i want to extract from a file in c++ ? I have this data file in columns format, something like: x y z 1 2 3 4 5 6 7 8 9 I know there is the command file.getline() , and this...

The specific information of secondary neutron source in French 1300MWe and N4 PWRs are needed, e.g.the total mass of Sb-Be in core and the thickness of Sb-Be cladding with stainless steel, but unfornately I couldn't find any useful information in google in English. I guess some informatio could...

An interesting paper has appeared on nature.com: http://www.nature.com/articles/srep32815 The abstract: I expect this to spawn plenty of pop science claims about "scientists say we can reverse entropy". But the paper itself looks like a good discussion of how the second law actually works...

What is information?

http://m.phys.org/news/2016-09-quantum-internet-teleport-particle-kilometres.html Is it possible to teleport information?

What happens with the information about the curvature of the trajectory of a body when the body stops? We know that to assess the curvature of a path we must calculate the value of a fraction of which the denominator is speed module (cubed). But if speed module is canceled, this fraction can not...

Hello. First of all, I must say that I'm new to this forum, so I apologize if I'm posting in the wrong section. I'm a 17 year old with not that much knowledge about physics, so if what I'm talking about makes no sense or is completely stupid, just let me know. A couple of days ago I asked...

Part 1 : http://mathhelpboards.com/pre-algebra-algebra-2/draw-venn-diagram-include-given-information-19723.html#post90092 Among the 40 persons who visited the clinic , there were persons who were on medication and those who were not on medication as well. An incomplete Venn diagram drawn using...

Problem It was revealed that out of 40 persons who visited a medical clinic , 20 heart diseases and 25 had diabetes. All those who had heart diseases and all those had diabetes suffered from stress too. 3 persons suffered from stress only had 4 persons did not suffer from stress. i.Draw a Venn...

I have in mind thought experiment where physicist is in elevator falling towards the Earth. Question would be if he is not allowed to look outside, how would he detect the presence of the planet? Let's not take in consideration tidal forces and assume he is taking local measurements during small...

What I know, $\angle RQS=25^\circ$(Inscribed angle theorem) & $\angle RSP=110^\circ$(opposite angles of a cyclic quadrilateral add upto 180) $\angle TSP=70^\circ$(angles on a straight line add upto 180) (Happy) Many Thanks

Has anyone analysed the LIGO merger detection http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.116.061102 in the context of the BH information paradox? Is there any evidence that the gravitational waves carried any information that could compensate for the change in areas of the initial...

From my limited reading I get the impression that the bouncing black holes proposed by Rovelli and Vidotto implies a solution to the information paradox. The information comes back out when the bounce happens. But how does this relate to the idea of complimentarity? It seems the latter was the...

Hi all I'm looking for general information on "back pressure" specially in a syringe. So when you put your finger over the top of a syringe and depress the plunger then release the pressure on the plunger and the plunger moves back slightly. I'm struggling to find some specific information...

I refer to a Schwarzschild Black Hole as the simplest example, and a well defined time outside the hole, say the Schwarzschild time. The information paradox of BH deals with the question of what stuff has fallen into the hole, but I am not aware that it deals with the question when the...

Homework Statement I came across this question in another forum and the members of the group said it can't be solved due to lack of information. Can anyone solve it? Homework EquationsThe Attempt at a Solution

LGG uses graphs which pass thru areas. does information follow these graphs?

What unification programme has information as the primitive that is accepted in the mainstream?

Say you wanted to heat up your room. You could choose between an electric heater that outputs 500W or a PC that draws 500W. In both cases, the amount your room would heat up by would be the same, but the second case is much more advantageous because the computer can process information before...

Homework Statement So I'm getting an error when I try to compile my C++ code: Debug Error Abort() has been called I have commented the code reasonably well, but the idea of the program is to take a file, separate the contents in each line to a part of a structure containing: Product Lookup...

I had applied one month ago into some universities, with the aim of switching my university major. (I studied history). I went to the entrance exams for computer science and engineering oriented fields, and waited anxiously for 1 month. I was not sure whether or not my entrance exam score was...

I heard recently that Dr. Maldecena recently commented to Dr. Susskind, regarding the black hole information paradox, that ER = EPR. Can anyone illuminate this for us mere mortals? It seems to link all information via non-locality, which has interesting implications.

what is the best quality to know if a gas for example became solid ...soldification Speacking about small quantity of gas that we can't see with our eyes ... what electrical quantity that i need to read to know that this very light gas become a solid metal and could that quantity give me...

What information do you get by reading that some sample production (like the W/Z for Powheg) is normalized to the NNLO cross sections?

Hi everyone. I'm currently just beginning my studying for my HAM license, and had couple of questions... 1. when looking at different items, a battery, a lightbulb, my Nintendo DS, etc, the information about the electronic is different. For example, this battery I have here shows that it's...

Could someone explain why we can not use the double split experiment with entangled photon pairs as to communicate information at infinite speed? Switching off and on readers effects whether the other photons displays as interference or as particles; so why can't we use this to send 1 and 0s...

It's said that information is never destroyed ( I know there is some controversy here regarding black hole information loss but let's put that aside for the moment). But what about created? I information a conserved quantity for the universe as a whole? Is there a consensus on this issue? It...

I've heard a few times that information can't travel faster than C, but what if you have an extremely dense metal rod that extends for 1 light year in length, the moment you move it here, wouldn't it instantaneously move at the other end 1 light year away? Or would the electrons that make it up...

So I am studying chaotic dynamical systems and I need to find mutual information between two chaotic time series say x(t) and y(t). Any help would be much appreciated.

How is information conserved when one form of energy is converted to other? Like how a black hole's gravitational energy is used to create photon pairs near the event horizon, what happens to the information in the gravitational wavepackets (gravitons?) and how is it not lost?

I take an interest in physics in my spare time (in IT during the day). I have a query regarding the 'problem' of information loss at a black hole, and would be grateful for some enlightenment. It seems generally regarded that any information going past the horizon of a black hole is...

As far as I understand, given that there is such a thing called entanglement, we know that there are non-local interactions. The line that this is usually followed with is "since no information traveled faster than light , locality isn't violated". I have a few interrelated questions about...

Hi if their is continues power supply required to hold the load by actuator or only electric supply needs to move the actuator pin

If we measure, say, the polarisation of a photon, the polarisation state of the photon collapses along the eigenvector of the observable corresponding to the measurement. This may seem as a loss of information of the original polarisation (for it is now collapsed into another value). However...

Watching a physics documentary I heard the following statement 'If an object falls into a black hole, what happens to its information'. I have a problem understanding the definition of information Is this. Information we could have gained through study? Or, Information governing particles at...

Hi. I hope this is the right forum for the question. Landauer's principle says that the erasure of one bit of information (1 or 0) requires kBTln2 of heat production. When he talks about erasure, it means "resetting back to 0 (or 1)" after measuring. He says something along "this is needed as...

Hi. I know how optical fibers work but where is the information in the light signal passing through it? Which characteristics of the electric field carry it? I begun to think about it because I was intrigued if they took into account things like the Goos-Hänchen shift or angular deviations in...

Suppose that a given population is endowed with a pair of characteristics T and K. Let's think of these characteristics as random variables (T,K)∼BiNormal((μT,μS),(σT,σS),ρ) I observe the realisations of T for a sample consisting of those individuals with K<a, where the selection threshold a...

Has anyone analyzed the process of Neutron formation and decay from the perspective of "information conservation"? Does anyone have any thoughts on what the results of such an analysis would be? What is the status of the observed evidence of reality in respect of whether one should conclude...

Homework Statement Prove the following relation for ##\zeta:=r e^{i \theta}##: S(\zeta)^\dagger a S(\zeta)= a \cosh r - a^\dagger e^{i \theta} \sinh r with ##S(\zeta)=e^{1/2[\zeta^\ast a^2-\zeta(a^\dagger)^2]}## and ##a## being the annihilation operator with eigenvalue ##\alpha##...

I have just finished my 2nd year of undergraduate study, which had the first pass of QM in it. I want to do a PhD in Quantum information/computing. What can I learn in my own time to get me closer to understanding QM information/computing? Currently I only know what we covered in lectures, and...

I was thinking about a gendanken experiment that I don't know how to solve: Imagine we tie one extrem of a rope in the Earth and the other one in the Sun, with some tension, and connected to a dynamometer (obviously in ideal conditions: no heat, no rotation etc.). My question is: when will the...