Information Definition and 990 Threads

Hey folks, I have a pretty simple quantum information question that I was hoping somebody could answer. let's say I have a pure state \ket{\psi} = \alpha \ket{10} + \beta \ket{11} + \gamma \ket{01} + \theta \ket{00}. I then perform a measurement on only the first qubit and observe a...

can someone explain information loss paradox in layman terms without using any quantum physics terms...i read in some sites but i couldn't understand as they are explaining using some jargon terms...

I've recently started a mini project on typical doses that patients receive when having particular CT examinations and there is just something that I don't really understand that I was hoping someone here might be able to help out with. Now when a doctor takes some CT images the CT machine...

Agree or not i think we need more information, so what space exploration would you support?

Hi there, Let me start by introducing myself. I am a student who considers himself to be a very scientific thinker, that is to say, not one who believes in mystical thinking, but I am not studying physics. I am trying to learn more about this for my own edification (and I will try to be a...

I am in college and have no formal training in physics, but i really enjoy the field. I was reading about redshift and am currently stumped in regards to its relation to light. I have read that light is constant, but in redshift the wavelengths of the light lengthen. I was wondering if light is...

Theory of Relativity says nothing can exceed the speed of light. My question is: Can any information be made to travel faster than 'c'? suppose, i have a light torch of very high intensity which can be rotated on an axis(its stand). the light is made to fall on a wall(extending for millions...

Homework Statement In Figure 8-50 (nothing important other than 1.2 m height difference, the higher level is completey flat), a block slides along a track from one level to a higher level after passing through an intermediate valley. The track is frictionless until the block reaches the higher...

I need help on writing an excel program that will allow my company to have multiple tabs with some of the same information linked. I would like to have the people in my company each have a tab with there information on it, and when they change something in there tab the main tab with the master...

Does a gamma ray ray carry enough information to prove its source?

Why there isn't "missing information" in QM First of all, can I ask you to be a little patient, because my years of performing quantum calculations are well and truly over. I write computer software for an insurance company now! I have noticed that every so often, a member of the public who...

I need some information to complete my math homework. Dates and basic biographical information on Cesaro and Grandi Grandi's role as a popularizer of calculus, and how it depended on the time at which he lived An account of Grandi's series and of why it deverges An account of Grandi's...

Was wondering if anyone has any good references on exo planets, how their data is listed, a compilation of any relevant information. Much appreciated. :bugeye:

[SIZE="3"][FONT="Comic Sans MS"]Dear friends, Hi I need some information about FBM (Fractional Brownian Motion); i.e. papers or links including its theory, its algorithms and ... . please help me.:shy: Thanks & Good luck

Consider the following riddle: You have 25 horses and want to know which are the 3 fastest. Whenever you race horses, the order of finish accurately reflects the relative speeds of the horses but you can only race 5 at a time. What's the minimum number of races required to determine the 3...

Hi , How are you?? I would like to inquire about these questions: what is Information technology?? What is the difference between information technology and Information system?? What is the most company need:Information technology-computer science-Information System-MIS...

The entropy of a system is S = k*ln W If we obtain some information about the microstates, e.g. know the location and velocities of some of the molecules, then W is decreased by a amount w, so S1 = k*ln(W-w) That is an decrease in entropy, i.e. S1 < S. Do physicists still "believe" so?

Hi everyone, I am doing research on flows in capillary tubes with wetting discontinuities, and I am needing to find some information on coatings that can produce these wetting discontinuities. I have come across some papers that mention a 3M coating "FC-723", and I was wondering if anyone knew...

Hi, Some Qs on information -- something rather new to me. I'm not quite sure what to do with these: Homework Statement a) Lack of information is defined as S_{info} = - \sum_{i} p_{i}log_{2}p_{i} (p_{i} is the probability of the outcome i). Calculate the entropy associated with the...

The following is the account of an argument that I had with my friend the other day: At 7.45 PM my friend asked me what time the mail room would be open till. I said that I did not know but that it was unlikely that the mail room would be open this late. He then said that he was not busy at the...

If I am correct, information cannot travel faster than the speed of light? So, let's say a rod, longer than the distance light can travel in a second was constructed in space. It is rigid and firm, and not bendable. At one end, is a button, and when the rod is tilted, it presses this button...

May i know what is the benefits of source coding and channel coding? why we need this?

As far as I can see, almost all the major textbooks on electrodynamics and nonrelativistic quantum mechanics make the following statement somewhere: The group velocity is (at least in lossless media) the speed of information propagation and it is always smaller than c. In the past I have...

Where in Windows XP can I find information about my processor such as the architecture?

I need some detailed information about Polaritons, and their 32K BEC.

In some village rain falls with probability of 0.5 (statistically), e.g. tomorrow it may or may not fall, the chances are equal. A local meteorologist gathers information, allowing him only to predict rain falling in the village with average success rate of 75% (about 3 of 4 predictions are...

I'm trying to build a comp for gaming but i don't know anything about modern hardware and searching google for "motherboard reviews" is giving sites that seem to assume i know what I'm looking for. when you guys are trying to find some of the best stuff on the market, where do you turn too?

There are in fact many "information theories". Broadly speaking all of these actually define a notion of "information" in terms of a notion of "entropy". In fact, from a basic notion of "entropy", many of these theories define a "conditional entropy" and from this "information". The most...

Is information theory the crucible of astrophysics in the 21st century? The number and quality of cosmologically related IT papers in the past year is impressive. I am admittedly swayed by this approach. For example: arXiv:0708.2837 The Physics of Information Authors: F. Alexander Bais, J...

Can anyone tell me if it is right to say that maximum power of a hydrogen oxygen fuel cell varies directly (with constant efficiency) with gas flow rate at constant pressure at room temperature

I have recently been studying Gregory Chaitin's "algorithmic information theory" for a school project. It describes the complexity of mathematical objects by the size of the smallest Turing machine program capable of computing them (in bits). It also defines a "random" object as one with an...

Is there any theory of information that considers a 'bit' to be something that only exists relative to a pair of systems exchanging information? I.E there is no such thing as an isolated 'bit'.

Speed of information – effects of on classical mechanics. (This is not a homework or coursework question. Even if the problem stated is simple, the answer is maybe not.) Problem: A mass is hanging vertically in a not heavy, quite inelastic and hard to compress cable which is fixed in the...

Assume there is Police spaceship that did catch a Bandit spaceship by a thin, light but strong high-tech line which is one light minute long. The Police space tries to pull the Bandit Space into prison but the Bandit space reverses its engines so that both space ships now stand still – say...

what bis the diffrences between information technology and information communication technology? What is the avaiable works in each one?

Does anyone have a chart of what a straight pipe flows in cfm? Like 3 inch inside diam.? 4 inch? Etc? Thanks:)

hi i am doing my M.Sc. Physics... i am interested in pursuing my Ph.D in Physics in USA... wht more tests do i need to take other than GRE and Toefl... i heard abt physics gre recently but know nothing abt it... please tell me abt the test and is it really necessary for pursuing a Ph.D thank you

101 key ideas in Physics by: Jim Breithaupt A Brief History of time by: Stephen Hawking The Universe in a Nut Shell by: Stephen Hawking Explaning the universe by: Charap I tried the books I found listed under other questions but unfortuantely our dear library does not have any of them...

Hi all Would it be possible to store information in a linear system?

ok I have this question and I am having some trouble putting it into words. Heres an example. Lets say there are particles X and Y that can be in states A or B. X is in a superposition between state A and state B. Y has a 50% chance of being in state A and a 50% chance of being in state B...

Hello, This is my first ever post in an entirely science-dedicated forum. On another forum, another user and I theorized that the energy transfer in hydraulics from one point to another is instant. He initially posted about electricity being instant because electrons move at the same speed...

Out of curiosity, how valuable is a physics degree as compared with an electrical engineering degree, aerospace engineering degree, or materials engineering degree? Will a physics degree be very useful in private industry. I kinda want to work in private research and development, but I want it...

I was hoping I could get some advice from planners or people who work with GIS(Geographic information systems.) My advisor and I had a meeting a few days ago and he suggested that I obtain a certifciation of GIS through the geography program. I'm not exactly sure what GIS is and how it is...

How do you react to any new piece of information presented to you? I generally get pictures in my mind. I thought everybody does. However some friends recently mentioned that they have a difficult time visualizing. Is it unusual not to visualize?

Please clarify the following view: An EPR-Bell experiment - when one particle in a Bell correlation is measured, this instantaneously affects the properties of the second particle. To me this seems as if information concerning the measured particle has "arrived without travelling" to the second...

I am wondering if anyone has a source for the specs on beverage container valves? I am looking for replacement o-rings and I don't have the valves in front of me, so if someone has a source for the specs, that would be great. Thanks!

When working with data, one should see that information can not be created except for random ones. Should there be a law of information preservation?

The famous Bell experiment would somehow proof non-locality and/or traveling of information faster then light. A very simple explenation of the experiment is this: there is a subatomic event that creates a particle pair going opposite directions. The subatomic event determines the possible...

As far as I know, net information content in the universe is constant. How about this: A child draws a simple skeleton of a house connected to another house with a pipe and draws a similar pair of houses right next to them with a fallen tree between the two houses. The second pair of houses...

Among the uncertainty relations in QM we have X,P and E,T. In my perspective (and mine only), measurement leads to information, and information is correlated to energy. Nevertheless, information is certain. Does this means that information is a reduction of energy?