5 ms·

Why we say nothing can't go faster than speed of light when on the other hand we have quantum entanglement which shows otherwise. I knows this is a dumb questi

by thyrox 5y ago

Why we say nothing can't go faster than speed of light when on the other hand we have quantum entanglement which shows otherwise. I knows this is a dumb question but please pardon me as my knowledge of physics is very limited.

pxue 5y ago
Quantum entanglement has not been able to show any usable information can be passed faster than speed of light. So for example, if two bits are entangled, you flip one bit, the other bit flips at a completely unpredictable way. Hence, no rule is technically broken.
- kristov 5y ago
  Hasn't some information been passed? You flip one bit, and if your observing the other bit you know the first one was flipped? So you know when something was done to the first bit...
  - atombender 5y ago
    But observing the other bit changes the outcome. The whole point is that you don't know the outcome until you observe one of the particles.
  - spartanatreyu 5y ago
    > Quantum entanglement has not been able to show any usable information can be passed faster than speed of light. The key word being: "usable". You can have two bits of quantum information entangled together so they are always opposite values. Then (while keeping the two bits entangled) separate the two bits and place each inside a box without looking at the bits. Then move the boxes apart to the other side of the world. Quantum Entanglement says that we can open one box to look at the value of the bit inside that box and know that the opposite box has the opposite value. Alice opens her box and sees the bit "0", so she knows that inside Bob's box is a bit with the value "1". So depending on which quantum mechanics interpretation you're using, Alice's bit has to share some information with Bob's bit to determine what each bit's value is. Depending on the time that the boxes are opened, we have experimentally proved that if information is getting transmitted between the two bits and if it is travelling through the space between the two bits, then it must be transmitted faster than the speed of light. The problem with trying to use this "transmission speed" to send information is that there is no actual way to send any usable information with it. We can open a box on our end to see which value we got, but we don't know if we got value because we opened the box first, or if the other person opened their box first. The only way to tell is to go and talk to the other person to tell them the time that we opened the box which in and of itself is slower than light.

by thyrox 5y ago

pxue 5y ago

Quantum entanglement has not been able to show any usable information can be passed faster than speed of light. So for example, if two bits are entangled, you flip one bit, the other bit flips at a completely unpredictable way. Hence, no rule is technically broken.

kristov 5y ago
Hasn't some information been passed? You flip one bit, and if your observing the other bit you know the first one was flipped? So you know when something was done to the first bit...
- atombender 5y ago
  But observing the other bit changes the outcome. The whole point is that you don't know the outcome until you observe one of the particles.
- spartanatreyu 5y ago
  > Quantum entanglement has not been able to show any usable information can be passed faster than speed of light. The key word being: "usable". You can have two bits of quantum information entangled together so they are always opposite values. Then (while keeping the two bits entangled) separate the two bits and place each inside a box without looking at the bits. Then move the boxes apart to the other side of the world. Quantum Entanglement says that we can open one box to look at the value of the bit inside that box and know that the opposite box has the opposite value. Alice opens her box and sees the bit "0", so she knows that inside Bob's box is a bit with the value "1". So depending on which quantum mechanics interpretation you're using, Alice's bit has to share some information with Bob's bit to determine what each bit's value is. Depending on the time that the boxes are opened, we have experimentally proved that if information is getting transmitted between the two bits and if it is travelling through the space between the two bits, then it must be transmitted faster than the speed of light. The problem with trying to use this "transmission speed" to send information is that there is no actual way to send any usable information with it. We can open a box on our end to see which value we got, but we don't know if we got value because we opened the box first, or if the other person opened their box first. The only way to tell is to go and talk to the other person to tell them the time that we opened the box which in and of itself is slower than light.