Quantum Theory

A double slit experiment is performed. In the middle of the experiment table, there is a particle source. The source emits entangled particle pairs, one by one. The two particles in each pair are, of course, emitted in opposite directions. There are two identical double-slit experiment setups - the left one (A) and the right one (B). Each setup consists of one screen with two slits and one display screen. The fringe pattern is visible on both displays screens, A and B. Is this true? Or is there any reason why there would be no fringes in the case of entangled particles? If the experimenter at the side A (Alice) now makes a measurement effort to determine throu…

If one reads through Wikipedia on De Broglie, De Broglie-Bohm, Matter waves, Electron waves., apart from a dose of Mathematical Awesomeness, and Dread, It becomes difficult to understand the different Waves. For instance : IS THE WAVE ASSOCIATED WITH ALL MATTER ( Electron to World ) the SAME WAVE that comes out as RADIATED SINUSOIDAL ELECTRO-MAGNETIC WAVES that come out of Atoms when electrons cause waves of photon light to leave atoms. Namely on energy band change? Even Wikipedia asks someone to come into Wikipedia and sort out Waves. link http://en.wikipedia.org/wiki/De_Broglie-Bohm_theory#The_conditional_wave_function_of_a_subsystem …

I was watching a programme recently, generally centered around cyberwarfare, and the reliance of the web upon prime numbers and quantuam computing was a component. Anybody care to discuss some of the features of quantum computing, what we might expect from it, where it's up to in terms of progress, how it differs from everything we've been doing up until now in computing?

So the problem is as follows. you have two qubits in the state a|00> + b|11> - after measuring the first in the sign +- basis and after getting + you need to describe the state of the second qubit in standard 01 basis So first off I changed the basis of the two qubits to the sign basis on the following lines (sorry for the plain test but \ket{} is not accepted by our latex renderer |0> = 1/sqrt2 |+> + 1/sqrt2 |-> |1> = 1/sqrt2 |+> - 1/sqrt2 |-> a|00> = a(1/sqrt2 |+> + 1/sqrt2 |->)*(1/sqrt2 |+> + 1/sqrt2 |->) = a (1/2|++> +1/2 |+-> +1/2|-+> +1/2 |-->) b|11> = b(1/sqrt2 |+> - 1/sqrt2 |-&gt…

Here is a paper i ran across while surfing the net and it peaked my interest even though my understanding of it is somewhat less than zero. It suggests that the quantum vacuum can be manipulated in a way to provide thrust without reaction mass. They mention travel times to Saturn in days or weeks instead of the current years, what does every one think? http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/20110023492_2011024705.pdf

This topic is both gravitational and electronic in nature. It could easily be in the relativity forums, but also has significance (maybe) in the electronic world of QM. Einstein described his gravitational EP by envisioning a "man floating in an elevator." The man is at first floating because no accelerations are "present" inside the elevator.The man has a cop's radar gun, and at first, the radar does not register any Doppler shifts off the interior walls of the elevator. They "look" stationary, and do not appear to be moving either towards or away, because the radar sees no Doppler shifts. Suddenly, the radar does register a Doppler shift, and one of the walls appears to…

I can't seem to find much on the specifics of tauonic atom formation and decay, which I guess makes sense because the tau particles we observe don't live long. As I understand it tauons on their own decay very quickly, but their orbital is more limited by their higher mass rather than the decay. But, why exactly does a tau particle decay so quickly? We have an oscillation mode of an electron, it just sits there and there's nothing happening, no decay, why does the higher energy cause decay? Perhaps it is a more physical property than I am giving it credit for and there is simply enough energy for a separate oscillation of a matter field to "spit off" or something to do wi…

As there were scientists like Richard Feynman ( now dead ). Who today is considered to be the Top Authority on Quantum Theory ?

I obtained a modern set of constants (c, rest mass of electron and proton, etc.) from NIST. I then used their hydrogen energy level equation and performed a prediction of the 1S1/2 - 2S1/2 transition energy and its frequency. NIST also lists the observed frequency for this transition. A prediction using only the basic Dirac energy equation (as posted by NIST) produces an amount of nonzero prediction error. This is to be expected, nothing is "perfect." Then I added in the QED corrections for these two levels, and did another prediction. The prediction error got worse. I would assume this is not suppose to happen. Dirac + QED should work better than Dirac alone, but it does…

I've seen the quantum locking stuff and have a fairly moderate understanding of how it works but on the quantum level how does energy flow through a wire and a superconductor how exactly is it different I'm asking this as in how does it flow on a quantum "level"

You tube demonstration of quantum levitation... http://www.youtube.com/watch?v=VyOtIsnG71U

Hi! Well I was wondering if you and I would to do the double slit experiment together and I would to measure which path the electron would take through the double slits and never ever tell you the results of what I saw and you did not know that I am measuring. Would you see an interference pattern? I have another question as well, let's say I put the measuring kit next to the slits so they are ready to observe the electron. Well if you did not know anything about it and I would be off to let's say England would there be an interference pattern?

Why do scientist ponder over Strong Nuclear Forces?? Would this help in any way shape or form in the evolution of mankind as a whole? What would this new discover do?? Perhaps maybe understanding strong nuclear forces could advanced our methods of finding cures such as cancers and other health concerns that the world can benefit from. Or maybe we could develop easier methods for precise accuracy versus averages? I think that this discovery would infact allow us to create space vessels for inter galactic travel! I think all the possibilities from this and somehow look forward for the future. But how far away are we from understanding the full po…

[math]\Delta x \; \Delta p \ge \hbar[/math] [math]\Delta t \; \Delta E \ge \hbar[/math] what about [math]\Delta \theta_{\perp} \; \Delta L \ge \hbar[/math] ? i.e. a wave-function confined in angle (about some axis), would be required to possess a statistical spread, in its angular momentum, about said same axis ?

Hello, Can there be quantum fluctuations within a singularity? Thanks, Rusty

Is it possible that nuclear physics and financial markets to fallow the same laws of Nature? This paper suggest that. https://www.researchgate.net/publication/251876307_Quantum_Tunneling_of_Stock_Price_in_Range_Bound_Market_Conditions

What we hear as sound is a pressure wave moving through the air, sound is the energy from an action being propagated through the atmosphere. That works basically the same in any medium. So, is there any kind of science that tries to explain this macro effect of sound, via quantum theory?

imagine a double-slit experiment w/o the slit... i.e. a blob-like electron wave-function is projected towards a detector... imagine that the detector absorbs 90% of incident electrons, and reflects 10%... you mathematically model the physics on a computer, with a fully 3D computer simulation... the blob-like electron wave-function is some 3D lego-like blocky cellularized shape, occupying some swath of the 3D grid "voxel" cells... the discretized wave-function propagates towards the detector, time-step by time-step... eventually, the "front" of the wave-function reaches the detector... the first such grid "voxel" cell, at the detector, to be (pa…

I was having a discussion with someone a little while ago and he made a claim that I found completely preposterous. He claimed that the laws of logic did not apply at the quantum level, which seems entirely self-refuting, as violating the laws of logic is by definition logically impossible. When I say the laws of logic, I am referring to the Law of Identity, which states that something is what it is and is not what it isn't (X = X), the Law of Non-contradiction, which states that in a true dichotomy of X or ~X, nothing can simultaneously be both X and ~X, and the Law of excluded Middle, which states that nothing can be neither X or ~X. I know a fair bit about quantum …

I'm posting this idea in the quantum theory section because I know entropy is a quantum physics based concept. I was listening to some Brian Greene, and he was speaking about black holes and entropy. The idea that energy in a system can only increase got me thinking about recycling and other environmental concerns. When we manufacture consumer products, we're decreasing entropy of the object itself (car, toy or whatever), but with entropy of the manufacturing taking a beating. Now, when we recycle something that's already required a net increase in entropy, aren't we compounding the entropy by wasting resources in recycling it? Isn't it better to let consumer goods ro…

Hello there everyone, it's been awhile since I last visited here. In that time I have been studying very much so into quantum physics and have found what I'm most interested in, particle physics, and have been looking into it a lot. While looking around on the depths on the internet, I found this link, http://www.physics.adelaide.edu.au/theory/staff/leinweber/VisualQCD/OriginMass/index.html ,which seems to state that the internal structure of protons and related hadrons is much different than I thought. I always assumed that is was three quarks bound by gluons jumping to each other changing the color force of each. My question is that, is this just hypothetic…

- pi ratio and + pi ratio?? Question please..Particle Confinement Under fundamental forces here: http://hyperphysics.phy-astr.gsu.edu/hbase/forces/funfor.html#c1 It mentions how these are connected to the "confinement" particle in a box. It shows the "graphical symbol" - pi ratio " this is how it looks between strong forces" on the link above for QM. My question is how is it possible that pi " ratio" is 3d dimensional?????? Is this true? I thought pi ratio was a circumference... If this is truly coupled with The Uncertainty Principle, then "I am guessing here not debating" That pi must have an anti?? Also, how can pi ratio both be used a…

Whilst watching a programme this week on measurement and the history of science I picked up on the designation "Quantum Age". Although dealing with the history of measurement, and suggesting that improved temperature accuracy is becoming very important to science, esp. in areas such as engineering ( one area where batter understanding of heat measurement is sorely required) and by way of one example -- this should eventually allow companies like Rolls Royce to improve aircraft engines enabling greater fuel efficiency and .... wait... back on topic warning ... so anyway, naturally quantum computers cropped up and the naming of our new century too ... as THE …

Hello everyone Happy Summer! I am new and not as skilled as professionals here, however I will attempt my best at asking some questions I have for the science community in hopes to better understand some research I have been on for quite some time. My question: Can there ever exist an h constant to the Galactic Scale. I do understand that h = 6.62606957(29)×10−34 j*s I see the "negative exponent" and see that it is rather a small quanta of energy. Can this exponent in the h constant of 10−34 j*s " be scaled" to a larger system's dimensions having a positive exponent within the standards of known science ?? And if so, then can these be two h const…

im searching for more knowledge and seem to find physics and space based sciences interesting but while researching and studying these two terms came up many times and I find myself once again seeking more knowledge of this subject so if any one could offer the basic points and educate me a little it would be highly appreciated I should mention I taught myself most of what I know by watching documentaries on tv and watching sci-fy programs listening to their science and researching it I cant say how much of my knowledge is accurate so I welcome any corrections on my understanding of the science.