Information Definition and 999 Threads

does the fact that there is a limit on how much can be observed on electrons location and momentum have anything to do with the finiteness and conservation of information? is the total momentum plus location of an electron unknown to us or is it also unknown to the universe? meaning, does...

First of all sorry if this is the wrong section! For a physics assignment, I am given a graph of which I am to gather data from. Graph 1: In an experiment to investigate how the celcius temperature, T, affects the volume, V, of an enclosed sample of air at a constant pressure, a students...

Hi! As I understand it, Quantum Information Theory is an attempt to apply the Classical Information Theory (i.e 0's and 1's) into the Quantum realm of superpositions. I recently came across a fascinating interpretation of QIT wherein it was described as possibly the law that effectively...

Hey folks, so the extent of my knowledge in math is basic concepts from Calc I (I'm more of a programmer). Now, I was working on a 2D particle system and had a random thought: if I wanted to gauge the total amount of information contained in the system, how would I do it? The first idea I had...

Hello PF! (Not sure this is in the right section.) I've learned very little about maths/physics in school, but went back to uni last year to do maths. Physics is still a bit of an alien territory, but nevertheless I like exploring it in my own amateur way. One of the things that started...

Homework Statement A decorative light fixture in an elevator consists of a 2.0 kg light suspended by a cable from the ceiling of the elevator. From this light, a separate presses the emergency stop button. During the stop, the upper cable snaps. The elevator engineer says that the cable could...

hi i seem to be finding it difficult to understand the legal terminology and understand what I am actually reading, i work in an industry that requires me to wear ear protection, protective footwear and eye protection. The Ear protection is provided and meets all Health and safety criteria...

Hello, Say I have a system with a spatial part and a spin degree of freedom, hence the wavefunction generally looks like \psi_+(\textbf r) |+\rangle + \psi_-(\textbf r) |- \rangle w.r.t. for example the z-axis. Now what if I'm simply interested in the spatial part? Can I perform an...

hi, i was wondering, for a black hole, as everyone knows,the escape velocity is greater than light. this means that the information about the existence of the black hole in terms of light never reaches the observer. so if the black hole were the cease to exist at an instant of time, the...

I am an undergraduate student and full-time Emergency Medical Technician and I am trying to obtain a few basic measurements requiring the use of an accelerometer. What I require is a device that can measure acceleration of two directions, such as forward to rear acceleration and side to side...

How to understand "fisher information"? Hello, I am trying to understand what "fisher information is." It is defined as V [∂/∂∅(lnf(X,∅)) ]=E[ (∂/∂∅[lnf(X,∅)])^2 ]. From Wikipedia: Can you please help me understand why this is the case? How can this be explained by looking at the...

Infrared radiation, of wavelength λair = 1um in air, travels through a dispersive medium with refractive index n = 1.4505 and with dn/dλair = -0.01 per um at this wavelength. Calculate the speed at which the radiation carries information. So know that c/n = λf radiation carries...

Hi, I am a student in Europe. I have been reading through the posts on Graduate schools and the essays like the one by Zapper on how to become a physicist. I am now in the stage of searching for a PhD position. 1. I would like to know what you guys think about the scope of Quantum...

Hello there. I'm a 4th year computer engineering student who is just at the end of an Information theory class. It was nice, I thought I got a grip on all the concepts and so... But, I tried to explain to my girlfriend today the basics of information theory, and I failed to do so. The...

Hello, I am a french 15 aged boy and I have been loving science, engineering, physics for 3 years now. I inform myself on the internet and I learn bunch of things at school but I feel like I haven't learned enough, and I'd like to know where I could learn all the physics bases from my class...

They (physicists) say that information can't be lost and I heard Susskind saying that he thought information of objects going into a black hole was stored in the outside of the black hole while the material was sucked in. I thought information was almost like a fossil, where an imprint of an...

Homework Statement I'm working on some proofs involving equivalent definitions of an equidistributed sequence. I need some resources to learn about equidistribution. Any links or book titles would be greatly appreciated. Homework Equations For an equidistributed sequence, \lim_{n\to \infty...

Should prospective employers have access to financial information about prospective employees? Is access to that information useful enough at a level where an individual's rights to privacy should be disregarded? Should employers be allowed to ask for a credit check? It is my assertion that...

Hawking and others suggest that it is a very special deal that macroscopic black holes lose quantum information, but I only partially agree. It is clearly important that they do not preserve most quantum numbers - black holes may be a way to break a lot of conservation laws of particle physics...

A classmate approached me last week (after class) and asked why I ask about things that probably aren't going to be on the exam. I told him that it helps me understand things on a deeper level. He then said, "Do your understanding on your own, because it makes things confusing for the rest of...

For example, after the big bang, the only thing that decides the future is Newtons laws. However, we must take into account quantum effects we cannot be for sure what the future holds. Doesn't the same thing apply with information. How can we know the information about a system if there is...

I was wondering if there is currently a project by some government or NGO, in the same spirit as the Svalbard Global Seed Vault, to digitize all information (history, math/science, literature, etc.) and store it either somewhere safe on the planet or better yet on some other celestial body in...

I posted this question on two philosophy sites, but so far I have gotten no meaningful responses, predictably so because I'll admit this is a rather far-our idea. But wherever laws deemed absolute are broken, trying to deduce the explanation from the known and understood is not going to work...

Hello, Can you Prove that information is either increasing or remaining constant with time. Thanks.

Suppose we were to simulate 1D QED on a 1D lattice. How much information do we need at each lattice site given the mass, charge, and spin of the particles (does spin make sense in 1-1D spacetime?)? The links between lattice sites represent the gauge field? How much information is needed at...

If I understand correctly, Hawking Radiation is created when the anti-particle of a virtual particle pair falls into a black hole while the particle of the pair escapes. The anti-particle goes on to annihilate with a particle in the black hole. Is not the annihilated particle identical to the...

How do radio waves carry the information? I mean the information is digital: 1 or 0, but what is 1 and what is 0 from perspective of radio waves?

It was reported by 60 minutes that members of Congress may have benefited personally from information gained during the course of their work. This behavior is strictly prohibited on Wall Street - should the same rules apply to elected officials...

So I am enrolled into this course. And we are learning probability and statistics and all that good stuff. But one thing bothers me VERY much. I lie, a lot of things bother me about this course but here is the first one: Transformation of random variables. So far we have been...

Hey! I am a student and would like to know if it is possible to collect and handle real time information from traffic participants and find solutions with this information to traffic problems like traffic jams? Can you also cluster this information? Thanks Angelika

Hello, I'll try to explain this as well as I can... I was watching NOVA's special on The Fabric of the Cosmos and the segment on how information is both lost in the black hole and stored on the surface got me wondering "Is there a limit to how much information can be stored on the surface...

I was planning to skip fields, Lebesque measures/integration and complex analysis. Can someone who's given the test tell me how important these topics are? (I haven't looked at any practice tests yet) I haven't done this stuff in college yet so understanding them will take quite an effort on my...

Is it "Information" or "Interaction" that "Observes"? First off, I know there are many questions on this forum in regards to "does consciousness collapse the wavefunction" and I admit that this is roughly the same question in a different way. I wanted to approach this in a new topic though...

Hello, i want to know if there is any way we can describe the way our brain transfers information using Quantum Information theory. I have been looking at Quantum Information theory for some time now and would want to know if it will ever be possible to transfer information directly from the...

I seem to be at a loss to understand something pertaining to the role of the phase factors in defining quantum states and their consequences in quantum computing. So, I learned in class and read in numerous books, and online, that the phase factor has no physical significance as it does not...

To elaborate, are they looking for a specific last year thesis for example? I'm reading a four year physics MSci.

I've put the problem and my attempt all in one image. I would show the above using induction. But to show the order of the element in question, we need to know what power to raise the element to such that it equals the identity. I feel like the problem is missing information about the...

Could someone help me understand the strength of fields that can be produced with piezomagnetism? I have not had much luck with searches for these materials.

hello all i need to build my own vacuum chamber any references i build one but it is not working ... want your help and experience in it

I'm a graduate student, and now in the second year at graduate school I'm going to have to work on a research project on some field. I want to specialize in theoretical quantum information. My main motivation is that this field studies, in fact, quantum mechanics and is actually building and...

I was wondering how they did come up with the way of setting permissions using the linux program chmod by just using numbers. For example: 1 is for execute 2 is for write 4 is for read Any sum of those give a unique permission to a file: 2+4=6 Let's you write and read it. 1+4=5 Let's you...

So chalk nowadays is made up of calcium sulfate rather than calcium carbonate. I want to know if there exists any data on spectral lines of calcium sulfate. If not, does combining the spectral lines of calcium sulfur, and oxygen create the spectral lines of the original molecule? Why does...

To keep it brief I have had to change my degree to a BEng Aircraft engineering (year 4 hon year), the main hiccup:confused::confused::confused: the crash course that I need to do for matrix and one or two of the other subjects but it's the matrix work that I am struggling with . I need...

I have what may be considered a rudimentary question, but one which I've actually never asked and have always wondered about. Many people have posed the question as to whether or not a very long, rigid object could be "pushed" on one end and instantaneously transfer information across a vast...

Homework Statement If an electronic scale reads 502.4 g, what is the absolute uncertainty in the mass reading. Homework Equations Not sure The Attempt at a Solution Not a clue, it seems that there isn't enough information given. How am I supposed to figure out the absolute...

The title is quite explanatory of this post. It has been suggested in other posts that quantum entanglement may be used to send usable information at speeds which may be viable for interstellar distances, making viable the holograms of Star Wars. However, as I understand it, sending...

please the exmple for wims

what is information? or how is information connected with change and dependency ? take an example , y=f(x) if y is independent of x(say y=3),will there be information? how does the change df(x)/dx effect the information content?

May be am taking you a way too back, but I really don't understand what this Information in a black hole is ! I've bin reading about it for the past 2 days but could understand it in no way...Is it anyway physical?? and this sentence is almost killing me : Information gradually leaks out during...

Does anyone have information on how exactly a atomic clock works? I have had advanced quantum mechanics courses so I am sure I wil understand it. My problem is that I can't find any descriptive materials (with drawings), the wikipedia page is very vague about the different things. So can...