Information Definition and 999 Threads

In the information loss paradox, people say that in quantum mechanics , time evolution is unitary. They usually do not say anything about the measurement process of if they do, they briefly say that the measurement process does not violate unitarity either if one takes into account the...

Hi everyone, I was watching Susskinsd's lectures posted on youtube about Quantum mechanics and he started explaining his -1st basic law of physics saying: the conservation of information means basically that if you start with 2 quantum states (vectors) which are observably different, or...

Imagine a (purely hypothetical) situation where someone proposes a scheme that exploits non-classical, nonlocal interference effects to transfer information between Alice and Bob. Apart from the accuracy and plausibility of the quantum mechanical part of the paper, would it be necessary for the...

Hello, layman here, I have a simple question, could you please clear this up for me? Whenever I read about the information paradox, it always appears to me that it is automatically assumed that quantum fluctuations / virtual particle pairs are predictably random. Which leads to the loss of...

Isnt the creation of information the same as the creation of mass, or energy, in other words, not possIble? If I am an electron and at time =0 , my position and velocity are x y z and p q r, how can i have gained information when my position and velocity at time T are x2 y2 z2 and p2 r2 q2? My...

See title.

I split this off a separate thread in response to a post of @Nugatory . The matter was about the (im)possibility of transfering information using entanglement. This is a basic thread, so I keep it simple: There are two particles/detectors, A and B. The particles are in the singlet state. My...

It is said that the measurement done on a particle instantly affects its entangled pair because Bell's theorem excludes a hidden variable. That means there is a cause and an instant effect at a distance. Say we have two entangled particles A and B. If there is no hidden variable then the state...

I'm not sure if I'm posting in the correct category. Please direct me to the correct one, if I have made a mistake. As I have mentioned in my intro, my knowledge of physics is almost non-existent. I am writing a book series, and I'm trying to base my ideas on science (more or less). This is one...

I read recently that no information comes out of a black hole. Doesn’t the mass information exit a Black hole with ease? Say I am orbiting a black hole and looking away. If while looking away the black hole gobbled up another star I could tell immediately that something had changed inside the...

I have posted this in University linear algebra, but it is possible there is a simple answer for this and the the problem belongs in some other forum. I apologize if that is the case. I am starting with 3 points in 3 space, along with the centroid of the full data set. The data is in principle...

Why is the quantity "information" missing from the SI system? Also, if they did add it, do you think it would be added as a base unit or dimensionless derived unit?

In compression of information, once any patterns have been 'condensed' as much as is possible, the information appears entirely random. Any further compression produces loss of information and the quantity of information required to encode it is increased. In one theory it is supposed that all...

Just what is Information. That is in Physics how is it conceived? Is it a particle a wave a field or is it another thing in nature entirely. When info is exchanged what is being exchanged Or is it just a maths concept that has no physical reality. Et cetera et cetera. I have looked at other...

We have two points A and B, separated by 10 light years away. WE have an iron tube conecting the two points, so this tube its 10 light years long. We are at point A and want to communicate with B, we have two options: -move slightly the iron tube---> instantly the observer at B will receive...

At one point I read there was the concern that a black hole could lose bits of information. Then a theory arose that showed that all the bits in a black hole were to be found on the surface of the black hole. Thus if there were let's say 1000 particles in a black hole each of which could be...

Having trouble with understanding this equation and its theory.

I have just started googling/youtubeing black holes. One point made repeatedly discussed is the loss of information in black holes. In particular quantum bits. What I have not yet found is very much explanation of what these potentially lost bits might be. So what I would like to know is...

Hello, I would really like a book like Susskind's "An Introduction To Black Holes, Information And The String Theory Revolution: The Holographic Universe" but not so condensed. If you have anything to suggest please do so. Also, if you know of any book that contains any part of the above book in...

What happens to the information entering to the Black hole??

Last year I've finished the undergraduate course in Mathematical-Physics and Mathematics and this year I've started on graduate school on Physics in order to obtain a master's degree. What I'm really interested are two main topics: general relativity and quantum field theory. I also like...

I saw this paper and would like some comments on it if possible. http://www.pnas.org/content/114/19/4920.full.pdf

What is the difference between how digital information encoded into a hard drive and how information is coded into DNA? It just seems strange to me how you are able to encode information/data into a physical object.

1-Whats the relationship between entropy and İnformation ? 2-Can Entrophy always increases statement imply information lost ? 3-If it implies how its lost ?

This paper; https://arxiv.org/abs/1704.08613, Entropy evolution of moving mirrors and the information loss problem, discusses a proposed method to test the information loss paradox posed by black hole evaporation. Several possible outcomes are discussed, including a firewall scenario...

<Moderator's note: thread spawned from this previous thread.> I have a question only loosely associated with any of the above, but that I hope may interest the minds behind this discussion. Does the apparent discovery and confirmation of gravity waves give us a source of information...

Hello everyone, i was wondering if anyone knows which uses or applications has Shell Sort and what are the advantages and disadvantages of this sorting method. So far i can't find a lot of information on the applications only that is used in some form in the Linux Kernel and on a library from C...

In Delayed choice quantum eraser experiment (https://en.wikipedia.org/wiki/Delayed_choice_quantum_eraser) entangled photons are sent on different paths. They reach their detectors at different times. The one arriving early is called a signal photon. The photon that arrives at its destination at...

This paper offers a "first link of a chain", bridging physical and, psychological or linguistically, mental notions of meaningful information. https://arxiv.org/pdf/1611.02420.pdf Meaning = Information + Evolution Carlo Rovelli CPT, Aix-Marseille Universit ́e, Universit ́e de Toulon, CNRS...

Apparently there is a major uranium deposit at Orkney in the United Kingdom that might also be very high grade (the article seems to indicate it is 50.2% grade, which would be even higher grade than Canada's deposits). I've found a lot of information on the controversy surrounding potential...

I have always been fascinated with black holes and information paradox. If quantum bits made up spacetime. Could the information getting inside a black hole be possibility encoded in its quantum bits? Look at https://www.quantamagazine.org/20150428-how-quantum-pairs-stitch-space-time/

I have read that "Information is conserved", or at least that it should be. I read this in some discussion about whether or not black holes destroy information. (ref: Leonard Susskind, Stephen Hawking, The Black Hole War, etc..) It is believed systems in distinct states evolve into distinct...

Is it correct to assume that, in general, authors who have papers accepted by arXiv eventually try to get their work published in a journal? If so what should we make of arXiv papers which apparently do not get accepted by any journals? Should we take those papers as seriously as we would take a...

In lagrangian variation we are trying to minimize the action S = ∫t2t1 L dt. Consider a simple case of free particle. Imagine In a world that everyone one only knows how to solve ODE, Using euler lagrange equation, one has d2x/dt2 = 0 , give that we know the initial position of particle in the...

Hi, do you guys got information about g forces on a jet and maybe exercise and ansers where you need to calculate the g force in a turn? ty for the help Maximilian Popelier

I am not a physicist but I am interested in the double slit experiment and would like a definitive answer, from a physicist, to my question as follows:. If the which path is just detected by a detector, without it flashing and bleeping at the same time, and without the detections being recorded...

I'm sure that there are limits to the analogy between the event horizon of black holes and the "Rindler horizon" for an accelerated observer, but there are a number of similarities: For Schwarzschild spacetime as described in Schwarzschild coordinates: Spacetime is static, and a rocket must...

When you load a game from a disc into an Xbox 360, example being Call of Duty, what is the information on the disc classified as? Is it just a different form of application software like Google Chrome or are you just loading a bunch of game files from the disc?

I just recently learned about Leonard Susskind's work on conservation of information. From what I've read and from his lectures, conservation of information and the holographic principle are based on the reversibility of physical laws. Reversibility in turn implies determinism, so if...

https://www.sciencedaily.com/releases/2012/10/121028142217.htm Usable or not this seems to be a spooky statement can this 10000 be falsified?. Experiments have already shown that if you want to invoke signals to explain things, the signals would have to be traveling faster than light -- more...

Is digital information that travels across the internet massless? If we were to take out the cables(and maybe the electrons)from the equation, is the digital information taking up physical space?

Hey guys, I am trying to located more information on a polymer that was called celanese fortiflex. It was used in TRIGA nuclear reactors to hold samples in a high neutron flux and was developed (I believe) around the early 1960's. Some modern PE materials have been tested, but fall apart after...

To select an element from countably infinite set (list set of integers) you need to provide finite amount of information. To specify an element in continuum in general case you have to provide infinite amount of information: any real number is specified as countable-infinite number of digits. So...

I'm not asking about two way or even repeating communication. Is it possible to entangle particles, keep then entangled and send half of them far away, and delay their choice for an arbitrary amount of time? What I'm thinking about is asking a yes or no question: Is there life on Planet X? So...

Is there a minimal amount of information that one could use to make a universe, is this what string theory tries to do, I mean how much information would one need to make all the elementary particles, and how would one input energy to them, and what rules would be needed to build this universe...

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...

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...