Quantum Theory

https://en.m.wikipedia.org/wiki/Quantum_pseudo-telepathy I want to understand this phrase, and here is a simple explanation. Let's consider Alice and Bob are playing a card game like bridge. This game has a random element - each of the player deals the cards. Consider this game is played on a computer, and for random dealing of the cards, a pseudo random numbers generator is used. And Alice and Bob can make a deal that they use the same PRNG, so when Alice sees what random numbers she gets - she will know what numbers will Bob get. They can use this information for cooperating against other players. Another example: in many tasks the PRNGs are used, an…

How long will it take for quantum computing to actually be used in labs, or thinking further out, commercially? Is it true that it could possibly take decades? I've heard that right now it's not feasible but I guess people are still researching (from my understanding) what would necessary to create a quantum computer, how fast those would be etc.?

Hi, The average vacuum energy is estimated to about 3 GeV/m^3 (the observed). If relying on this value (when the calculated in extremely much higher). -And the Higgs field energy VEV, the vacuum expectation value, is both observed in the LHC experiment and fairly calculated to about 246 GeV. How are these differences explained in QM physics? 3 GeV versus 246 GeV? I understand that the VEV amount is presented without any special volume in mind. But surely the VEV isn't correlated to the cubic meter volume, though must be estimated to the Planck scale. Far minor than the m^3 which the vacuum is given with. The VEV is a universal constant thought to …

Are space dimensions objective like metres or relativistic like personal feet units? One way to find out might be if you changed the depth on the final screen of the double slit experiment. So when a multiprong interference pattern occurs for unobserved electrons then you could move that screen much closer to the double slit. This would help rule out the electrons moving diagonally to the interference prongs on the far edges as if the electrons were moving straight from the edge of double slit card to the interference pattern like a probabilistic wave. After all an electron is so small that even having the interference screen one centimetre from the double slit could be s…

They say an electron is either a bubble or a wave but how do you know an electron isn’t just a bubble in a sea of electrons?! That way the observer effect might make slightly more sense because the act of observation would burst or split an electron bubble. Could an electron have surface tension around an inner empty space much like the bubbles in a lava lamp? A candle light always burns upwards even if you bend a candle stick diagonally much like how geotropism dictates that the roots of a tree grow vertically downwards even on a steep mountain slope. So a candle flame is attracted to the more diffuse air above. Were light a heavy particle then muc…

If we have a volume of hydrogen gas, when not heated, only collisions without much change in heat (say it is in room temp.) If the volume is heated a bit, the collisions increase and the temperature of hydrogens in it also increase. If even MORE heat is supplied, the electrons in the hydrogen leave the atom and get excited. If WAY MORE energy is supplied, we might get nuclear fusion, (like what happens inside the sun), the volume is constant and the pressure increases with temperature. The question is:- What is the minimum energy required for an atom (say carbon (or) hydrogen) to undergo fusion and below the energy, it undergoes excitation and collision heati…

https://en.wikipedia.org/wiki/Superdeterminism "Physicists Sabine Hossenfelder and Tim Palmer have argued that superdeterminism "is a promising approach not only to solve the measurement problem, but also to understand the apparent non-locality of quantum physics". Howard M. Wiseman and Eric Cavalcanti argue that any hypothetical superdeterministic theory "would be about as plausible, and appealing, as belief in ubiquitous alien mind-control" Those seem like two pretty diametrically opposed interpretations of what is a.... (actually I have some trouble describing what it seems to be) It is apparently a theoretical loophol…

Currently I don't understand the point. If their task is to simply name three bits each, why can’t they, if the judge tells them the third row and the third column, name the option not based on this picture, but so that everything matches? For example -1,+1,-1 in the third row and +1, +1, -1 in the third column?

I'm looking where exactly, during a construction of the Feynman propagator \(D_F(x_1,x_2)\), a particle goes off-shell. It is on-shell all the way until before the last step: \(D_F(x_1,x_2)=\frac i {(2 \pi)^4}\int d^3 k \int d \omega \, e^{-i \vec k (\vec x_1 - \vec x_2)} \frac 1 {\omega^2 - \omega_k^2 + i \epsilon} e^{i \omega (t_1-t_2)}\) The particle is on-shell here because its 4-momentum is \((\omega_k, \vec k) \), where \(\omega_k^2 = \vec k^2+m^2\). Integration variable of the first integral is 3-momentum \(\vec k\), where each one of the three component varies from \(- \infty\) to \(\infty\). Integration variable of the second integral is …

Crystals may contain electronic real-space-eigenstates as ground states, which are spatially much larger than one unit cell, such as impurity states, standing waves at Brillouin zone edges, Anderson localization, etc. Every eigenstate is usually occupied by two conduction electrons with opposite spins, forming a singlet pair. Notably: if the eigenstate is limited in real space, then the excitation energy of each singlet electron is not necessarily negligible, so below a certain temperature the singlet pair can be lasting. Isn't this a long-debated pairing mechanism in superconductors ?

I've seen statements such as this kicking around for decades and always been troubled by a niggling doubt. I imagine that the phenomenon can be explained by normal electron scattering and tunnelling without invoking any deviation to conservation of momentum. But is that all there is to it? Is the momentum vector of a particle subject to variability due to, say, random quantum fluctuation in local field strength? This idea seems somewhat belied by the near point image my eyes can make of a distant star, but even so... My primary contextual interest is in the absolute deterministic nature of gas molecule trajectories between collisions - ie how 'straight' ar…

In systems theory, the measurement process is not a mystical matter. During a measurement, two systems come together. Described in: Quantum mechanical measurement in monistic systems theory. Doi:10.23756/sp.v11i2.1350

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Why does the invention of a quantum computer mean the end of RSA? I have seen many sources that claim this, but they never explain the “how.” The one explanation I have read is that they have one of the keys and the way quantum computers work they reveal the pattern only knowing the given part. My question is does this only imply to modern key sizes? What would prevent someone from using a quantum computer to make a gigantic semiprime to factor? And do quantum computers explain mathematical patterns? I don’t think by factoring the RSA semiprimes it would find a pattern. Isn’t the quantum computer still just crunching numbe…

I think I have read that there are circumstances where ,at the quantum level the direction of time does not apply. Is this is true ,is it just for limited circumstances or is it across the board? Do perhaps quantum systems evolve in time generally but some do not?

Normal quantum tunneling says that because of quantum superposition, there is a slight chance that a particle can just pass through a potential energy barrier. I realized that the reverse could happen too. Imagine that a particle, say an electron is shot through a single slit. Because of quantum superposition, there is a small chance that the particle could be blocked by the slit even though it appears as it is going straight through it. Is this possible? (For quantum tunneling) https://en.wikipedia.org/wiki/Quantum_tunnelling

In the de-Broglie wave equation, the more momentum a particle has, the less wavelength it has. What happens if a particle is at rest. Can this even happen? Does its spin count towards the equation?

In the double-slit experiment, what collapses the wave-function? The act of measurement? The information obtained from the measurement? Or the observer contemplating the information obtained from the measurement? The first is physical, the second informational and the third attributable to consciousness.

Hello, I have tried many, many times to learn the Schrödinger equation. The only problem is that it seems you need to know the wave equation to solve for it. Can anyone help me? I meant the wave function, not wave equation btw

What does it look like / how long does it take when the constructive Inteference pattern on the board behind the slits become two horrizontal bands? Is there a Video of this moment?

like is it even possible to split up one in the first place and if so how much energy do you need to do that

I have recently come across a dilemma. I can't figure out how electron microscopes detect the shape of electrons. Now, obviously you could just send them through a wire or something, but that would make them lose their shape. I am trying to make an electron microscope for a project (As the ones you can get are too cheap). I have figured out everything except detecting the shape of the electrons. Can somebody help me?

Will a persistent supercurrent in a superconducting (SC) aluminum ring decay, if we connect the SC aluminum ring to an aluminum wire and the remote end of the wire is located in a separate chamber with T > Tc (or H > Hc)? This question is more complicated than it seems, most physicists cannot answer it unambiguously and there is no experiments to the issue. Imagine, a persistent supercurrent flows in a SC aluminum ring. Then we connect the SC aluminum ring (without solder) to an aluminum wire, the second end of the wire is in a separate chamber with T > Tc (or H > Hc) and is not SC. The temperature of the SC ring is stable below Tc. Thus the SC ring is dire…

Hello everyone. After seeing @swansonts post about antimatter falling like matter, I thought of something. How would they fall without "Anti-Gravitons". Now I know that gravitons are still hypothetical, but if they are real, wouldn't an anti-particle just destroy itself upon collision with a graviton. So, what if there was an "Anti-graviton" That pulled it down? Or what if the normal gravitons quite literally aren't matter or antimatter? Maybe that is why we cannot detect them if they are real... Also, another thing to think about, maybe the reason gravitons are so hard to detect is because they pass through things like neutrinos. I am not stupid; I am just not very exper…

After a now closed thread, the conclusion seemed to be that in having to give up on 'local realism', the clear tendency was that we have to give up the 'realism' part. I was heavy involved in that thread, and based on many 'quantum authorities' and physicists in the thread, I also defended that. But as I keep reading different books on quantum mechanics, I also found other, well argued positions defending none-locality,e.g. some very clear exposés by Jean Ricmont. In Quantum Sense and Nonsense, he writes: This analysis fits e.g. very well to the video presented in the closed thread, in which is clearly demonstrated that the CHSH is based only on 'locality' an…