Tag Info

New answers tagged

0

Your suggested explanation is that the electron and positron have opposite but definite spins along an axis, but we can only use probabilities when predicting the outcome of measuring it So the idea is that the particles have a single value of spin of the sort that you see when you do a measurement. What happens in the experiment is that reglardless ...


0

Take two balls from different color and put them into a box with two traps. In the period between the balls are trapped and one open the box there is a mixed state for each trap with 50% probability that in the trap is the white ball or the black ball. This state collapses in the moment one open the box. Does that mean that until one open the box, the balls ...


1

Opposite spins yes, definite no. They are in a superposition of states. In one state, particle A is up while particle B is down, while in the other state, particle A is down and particle B is up. When the pair is created, they are in an entangled state, and only after measurement do they assume definite outcomes. The crux of the matter is that this ...


0

EPR might seems a thought experiment, but it has been translated into an actual physic experiment, especially by physicist Alain Aspect. You say quantum physic gives bizarre conclusion, that it is in an uncomfortable position, or that "philosophy of quantum mechanic" is at doubt. That's especially why it is important to really perform the "disturbing" ...


16

Even for things that seem very clear from the theory, you will want to check them. You asked I mean, what were they expecting ----- were they expecting the states of the particles to be not in co-relation? How would they explain for that? Well, of course they were expecting the entanglement. But finding that this is NOT there, would have been a huge ...


14

What you seem to not get from the paper is that the EPR-thought experiment actually made a prediction: It predicted that there are correlations within quantum systems that are stronger than in any possible classical system or any local hidden variable theory. The "spooky action at a distance" is just failing classical intuition. Don't read too much into it ...


3

And you cannot communicate information through entanglement anyway. So my question again : why the experiments? I think you will find that the technology is important in communication. Quantum cryptography is a way of sending secure messages with, for example, entangled photons used to send a key. If photons are intercepted between the sender and the ...


2

A thought experiment is not really an experiment, but an idea. Science requires people to be able to test ideas with reproducible experiments. I can't reproduce a thought "experiment". A reproducible physical experiment produces physical observations. See "Empirical research".



Top 50 recent answers are included