Recent content by leonid.ge

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    B Schrödinger's cat question

    Thanks!
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    B Schrödinger's cat question

    So if the the room is large and the cat starts walking away from the atom, the probability of the decayed atom influencing the cat decreases... When entangled particles are created, say a pair of electrons with opposite spins, they are truly entangled even when taken far apart. So would it not...
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    A Bell's inequality and experiment

    Why need in Bell inequality theorem, when you can just do the experiment with entangled and not entangled particles. If the correlation for entangled particles is notably higher, you deduce there is spooky action in distance.
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    I Passing information faster than speed of light

    Say there is a lottery on Earth with 16 bit numbers (from 1 to 65535), i.e. 65535 lottery tickets are sold. Now, we take 16 pairs of entangled particles, 1st particle of each pair is kept on Earth, 2nd particle sent to Mars. The winning number is randomly chosen (on Earth) by checking the spin...
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    I Why Does Quantum Entanglement Seem Puzzling Compared to Everyday Correlations?

    Suppose someone throws coins and once they fall on heads or tails, she saws them along the middle on two parts: one pointing towards the ground and the other pointing from the ground. Then she sends those two parts into opposite directions so after some time they reach two distant planets, one...
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    B Is there any practical proof that quantum entanglement really works?

    Is there an experiment confirming that correlations work on really large distances such as from here to other stars?
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    B Is there any practical proof that quantum entanglement really works?

    Suppose there is a new law: if measuring spin +1, then Biden will be president, otherwise Trump. Now, you went to Alpha Centauri and took with you one of the entangled particles leaving the other one on Earth. You measure you particle and see spin -1 which means the spin measured on Earth was...
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    B Is there any practical proof that quantum entanglement really works?

    But if you destroy the entanglement by your measurement, then how there is correlation if the particles are no entangled anymore? You cannot guarantee that both sides do measurements on the two entangled particles simultaneously, because simultaneous does not exist when talking of remote...
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    B Is there any practical proof that quantum entanglement really works?

    But if entanglement is destroyed after the first measurement, then how would you use it for sending information? Even if you could, you would only do it once.
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    B Is there any practical proof that quantum entanglement really works?

    So if one entangled particle is here and the other in Alpha Centauri, and we measure our particle spin as +1, we know that the spin in Alpha Centauri is -1. In 5 minutes we measure the spin again and it is now -1. Does it mean it changed the spin because particle's spin can take values +/-1 with...
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    I Relativistic length contraction

    Hello! I have a question. If there is a wooden rod which burns certain time, and an astronaut inside rocket lights two such rods: one oriented along the rocket's length and the other goes across the rocket, and an observer see the rocket passing by with a relativistic speed. Will the observer...
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    Why does time appear to slow down on a moving spaceship?

    OK, I agree, that in your experiment they will see the clock slowed down. But what is wrong with my experiment? For example, particles coming from Sun to Earth have longer lifetime, as their time slowed down. Say, particle approaches us and not passes by, and the particle has a clock and we...
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    Why does time appear to slow down on a moving spaceship?

    Please forgive my ignorance in STO, but I don't understand something about the following thought experiment. Spaceship flies from Earth with large speed. We observe the clock inside the spaceship from Earth with strong telescope. We see the clock showing 12:00. When we see on the clock 12:05 (in...
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    Optics: how to make eye focus in distance?

    For the 'full page magnifire' that you mentioned - this is just a magnifying glass that is useful for people fith hyperopia (who cannot focus their eyes enough to see close objects). In fact I am looking for an opposite effect: focus your eyes in large distance, but see things on computer...
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    Optics: how to make eye focus in distance?

    Hello! I have a theoretical & practical question. Theorecical: I noticed that when I turn on my smart phone camera application and look 'through it' on some distant object, holding smart phone 30 cm from my eyes, then my eyes are focused on 30 cm and not in distance. Is there a way...
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