Information Definition and 999 Threads

Hello all, I am wondering if anyone can point me in the direction of any good material that explains s-parameters. So far, I have encountered explanations that just confuse with no effort put into simplifying the concept. Even my lecturer assumes that the entire class are geniuses. I don't mind...

Does quantum computer can to send the information faster than light ?? I have read many of paper about quantum computer that come from quantum entanglement. The Quantum Entanglement may be use in Quantum computer.Does it can use to send the information faster than light or it can surpass the...

Is there a thread on this forum that discusses this paper? http://arxiv.org/pdf/quant-ph/0205039v1.pdf It would suggest that the quantum wavefunction is a representation of our state of knowledge of a system. Is this an accepted view?

I am attempting to get a good definition of the word "information", as in "information can be transferred at most at the speed of light".) Here is my attempt so far. Please indicate if this seems adequate. Starting from the definition in information theory: Given a probability...

Can anyone recommend some usufull links,pdf,... for information on large scale structure? I want to fully understand how in the cold dark matter model the the hierarchical formation of matter occurs and the role of the initial perturbations in the evolution of the universe. Thank you.

Hello, I've been struggling with the so often spoken idea that a metric tensor gives you all necessary information about the geometry of a given space. I accept that from the mathematical point of view as every important calculation (speaking as a physicist with respect to GTR rather than...

Hey, I am a physics year 3 undergraduate seeking to pursue a graduate education in the United States. I am from the Republic of Singapore, a commonwealth nation, with English as our official language. May I know if GRE is necessary for me to get into USA universities for graduate education?

Homework Statement You have a 1.0 m long copper wire. You want to make an N turn current loop that generates a 1.0 mT magnetic field at the centre when the current is 1.0 A. You must use the entire wire. What will be the diameter of your coil (in centimetres)? Homework Equations...

hello, I'm not a physicist, just a goofy gent with some far fetched ideas is it safe to say that all the energy and matter in the universe has been constant since big bang? would it be ok to assume that all the time and information has also been constant since the big bang? Been...

Hello, I need data (articles and books) about what connection there is between the speed (or the power) of a turbulent flow and the range of vibration frequencies that it can create on the body submerged in the flow. Thanks in advance.

Hi! I was wondering if anyone had any links or information to how conveyor rails work? Basically, I'm designing a product that would require a chair to move up and down an incline. I'd like to place it on a powered conveyor rail, but need more information on the mechanics and can't find any...

There is a graph of voltage gain against frequency...but it seems like for a gain of 1, that the gain increases after a certain voltage... I know that that doesn't make sense and there is something I don't understand. I have attached a doc with the image from the datasheet in it. How do I...

I did some quick searches and couldn't find any discussions on this topic. Anyone with background or ability to describe the basics to a novice. I understand the high level basic concepts, but don't know how information is encoded and how the qubits are operated on. Unlike boolean logic gates...

say you measured every particle which has entered a black hole say you measured every hawking radiation particle which exits the black hole my understanding is that if like... a proton enters the black hole, then an anti-proton needs to be emitted via hawking radiation. so if you measure...

Is anyone able to provide a resource for the proper formulae to use in determining blade dimensions for an aperture mechanism? Free would be best but readily available in a mathematics library is acceptable as well.

Suppose Alcubierre warp drives or some alternative form of warp drive is possible. Then surely a warp drive could enter the event horizon of a black hole, observe the interior, and exit the horizon, returning with information from within the black hole. What about black holes never visited by a...

Hello, I have been searching around for a topic of math that I am not familiar with. I'm hoping somebody can point me in the right direction. This has to do with Compound growth and decay when the two are combined. This occurs in trading(ie stocks,options,futures,etc.) And I am hoping I can...

Hi guys, I've been reading a paper recently about trapping pseudo molecules in a magnetic field gradient. It says at one point that one of the successes has been due to using microwaves opposed to lasers; they claim that the reason for this is because lasers are notoriously difficult for...

Would it be possible for a black hole to carve a trail of information on two dimensional space in the holographic universe? Could the black hole, acting as a conduit between the macro and micro universe, due to its properties at the singularity (at the plank scale) carve the the information...

If we have a qubit in a mixed state, let say 1/2(+><+)+1/2(-><-) and we measure it. Is then the result a pure state + or - ? If this is the case, then the entropy of the system decreases. Now the question another way round is : Suppose we measure a quantum system without gaining...

Hello. I was reading through Black holes and what happen when information falls inside the black hole. The intellectual battle between Susskind and Hawking...I also heard through the lectures on Susskind describing what is information. (a) Bits (b) A single photon (c) The n number of...

Hi, I just have some questions regarding the use of beam displacers, the below picture pretty neatly summarises what they do: http://www.fiberoptics4sale.com/Merchant2/graphics/00000001/What-is-Optical-Circulator-and-its-Appli_F29F/image_8.png My question is, what happens when polarised...

I'm having some trouble with my majors for college as an incoming freshmen. I love physics as a course, conceptually. However, mathematics has always been a subject of terror for me, leaving me destitute in the department of understanding. But as interested as I am, I'm willing to force myself...

Hello everybody, this is my first post to the forum. I am trying to learn concepts in physics at the moment. According to the theory, the concentrated mass of a black hole warps space-time so much, that not even light can escape the event horizon. I have a thought experiment. Say, half the...

"Physicists in Japan have shown experimentally that a particle can be made to do work simply by receiving information, rather than energy." It seems to be something like a demonstration of Maxwell's Demon. http://physicsworld.com/cws/article/news/2010/nov/19/information-converted-to-energy...

Let's say I wanted to create a GPS that gives live feed to a website and mobile application from relatively far away(probably at most a 20-25 mile radius). The GPS should provide ETA, weather status, and live current location. What would I need- mainly for the GPS, but also for the website and...

Homework Statement 2 KClO3 (s) + heat --> 2 KCl (s) + 3 O2 (g) If 0.20 g of KClO3 (s) decomposes in 2.8 s, at what rate is oxygen O2 (g) released over this time at SATP? The Attempt at a Solution 0.20 g KClO3 x 1 mol/122.5495 g = 0.001632 mol KClO3 Since 0.001632 mol decomposes in 2.8...

seeing the information is a form of entropy, what happens when gas confined to one corner of a cubic volume expands to fill the whole volume? Is information created? Would the reverse destroy information? I don't understand how a group of air molecules could change the amount of information they...

I have an old iPad that I don't use anymore and I'd like to re-use the digitizer on it for a little experiment (i.e. rip it out and plug it into my own creation), but I'm having a hard time coming up with any information on the device (pin layouts, data sheets anything). If anyone has any...

Ok, so I don't understand, what information is a photon carrying? It's mass, velocity or something like that?

A big hello to all physicist, chemist, engineers and anybody reading this thread, Back in the old days, information that used to be transmitted was analogue. Later it became numerical improving immunity vs noise; However I read a couple of days ago articles about the possibility of...

I am going to take part in a Physics contest in which I must present a Physical phenomenon. I chose to present the light-duality phenomenon. I created this thread so I can gather some information, and understand how things happened. What I have until now: Waves Vs Particles Waves...

So let me get this straight once and for all (can that even be possible in physics? lol). In quantum entanglement, does information actually get transferred? Most of the things I've read says something along the line that it cannot be deciphered. The information is sent, except there is no...

I'm just getting so fed up. When I go to a store to buy some stupid thing like a pillow, they want to know my zip code or phone number. When I try to take a tour of a gym nearby, they won't let me unless I give a cell number AND my email address. And now I try to sign into my old...

I'm struggling to understand the implications and origins of the 2nd law. Entropy is such a slippery subject. Wikipedia has many many definitions of entropy. I've been studying Professor Susskind physics lectures, so I'm most interested in his favorite definition: that information is...

A hospital would like to determine the average stay for its patients having abdominal surgery. A sample of 15 patients revealed a sample mean of 6.4 days and a sample standard deviation of 1.4 days.How do you display this in a normal curve?? any help would be appreciated. Thanks

I am trying to develop a graphical, interactive simulation of a wave function in position space, given an arbitrary potential. It works great, but as a final touch, I would like the user to be able to collapse the wave function, either by measuring its position or its momentum. My problem is...

I've been thinking somewhat about how to link mass to a number of information bits. Consider the universe as a self-referential representation of information. Each particle in the universe may be defined relative to each other particle in the universe as some number of bits of information. In...

I have three quick questions regarding the experimental set-up attached, in relation to Hardy’s Paradox. What possible detections are available, according to Quantum Mechanics, and do those detections indicate, for the electron and the positron, which path they took? I’m guessing not as at...

I read a dumb article on a UK mathematician modeling a zombie take over with impulse differential equations. Unbeknownst to me, were impulse DE and the fact that they are used in orbital mechanics. I am unable to find much on this topic tough. I believe it is relative new (1990). Does...

Long story short I'm failing to mention some of my past to a female I recently met. We hit it off pretty fast, and frankly I see myself falling for her very quickly. In retrospect I tend to say that same line about pretty much any girl I meet, and I have yet to feel love for or miss any of my...

A single photon approaches a polarization filter. It's orientation is described by a probability amplitude wave function. It is not reflected or absorbed, but passes through the filter. Now it's orientation immediately after is definitely known. Question 1: is there no...

Suppose I have a Gaussian probability distribution: N_{A}(0,1). A set of values are generated from this distribution to which an arbitrary amount of Gaussian noise, say N_{B}(0,0.5), is added and then the N_{B} values sorted from lowest to highest. These are then digitised by assigning 0...

Can anyone give me the proof or point me to a link to derive this First Integral of Bessel's Function. J_n(x)=\frac{j^{-n}}{\pi}\int_0^{\pi}\cos(n\phi)e^{jx\cos \phi}d\phi I have been searching all over and can't find the derivation. In fact, other than some basic Bessel's identities that is...

Homework Statement Problem 35, Section 7.3 of Dummit and Foote: Let I, J, and K be ideals of R. (a) Prove that I(J+K) = IJ+IK and IJ+IK = I(J+K). (b) Prove that if J \subseteq I then I \cap (J + K) = J + (I \cap K). 2. Concern/Question Despite the problem statement specifically...

Rovelli's FQXi essay contest entry argues for a simple proposition Whether it is information or entropy you are defining you essentially always need TWO systems. The interaction Hamiltonian will indicate which variables matter to system B. That's what determines which are the macroscopic...

For some reason I find it hard to comprehend that at the natural base level of existence (whatever that means), that the information-scape (all the stuff that is happening throughout space) is totally fragmented from each other, except of course for the "slow" transmission of information to...

Say I am in the middle of two people that are 2 lightseconds (we'll call this unit a distance that speed travels in 1 second) away from me. They are 4 lightseconds away from each other. So these two guys are my friends, and before they moved to 2 lightseconds away from me, I told them, if I am...

I am a little confused at the description of quantum information, even though I more or less understand the concept of a qubit as being a superposition. That which confused me was a phrase saying that the quantum information is the classical information that can be retrieved. But one can only...

I just found this video: with the name "Dark Matter Mystery Finally Solved, and It's Simple?!" (it has more than 7000likes and about 75 dislikes) . The problem here is that it's the first video that pops out when you write Dark Matter in YT search and it's not the only one of this type...