- #1
mataku
- 1
- 0
Okay, first of all so I'm in no way educated in the concepts and especially the notation of quantum physics; my knowledge is confined to a very simple superficial understanding.
However, if someone could educate me about why faster than light communication is impossible in the scenario I'm about to present, I would be very thankful.
My current understanding is that given a quantum entangled pair, 'forcing' a particular spin of a particle breaks entanglement, however, merely measuring the spin of a particle preserves entanglement (or the consequence of entanglement), and its twin can be measured to have the exact opposite spin.
I've also read that entanglement is possible with 3 particles at a time as opposed to only 2. From my understanding, if particle [1] is 'forcefully' given a spin, its entanglement between particles [2] and [3] is broken, so likewise I assume that the entanglement between [2] and [3] is also broken.
Given that assumption, it seems possible to determine if particle [1] has been 'forced' into a particular spin, or has been left undisturbed, by testing entanglement between particles [2] and [3].
In a communication situation, an ordered collection of groups of [1] particles would be sent light years away, and then an instrument would incrementally check, groups of corresponding [2] and [3] particles to see if they have been 'forcefully' disturbed or not. If a group of particles is found to have been disturbed (with a reasonable error margin), a 1 bit of data is generated, if not, a 0 bit of data is generated. Much like polling in computer science.
However, I'm well aware that faster than light communication is impossible in physics, so please tell me where I've gone wrong.
However, if someone could educate me about why faster than light communication is impossible in the scenario I'm about to present, I would be very thankful.
My current understanding is that given a quantum entangled pair, 'forcing' a particular spin of a particle breaks entanglement, however, merely measuring the spin of a particle preserves entanglement (or the consequence of entanglement), and its twin can be measured to have the exact opposite spin.
I've also read that entanglement is possible with 3 particles at a time as opposed to only 2. From my understanding, if particle [1] is 'forcefully' given a spin, its entanglement between particles [2] and [3] is broken, so likewise I assume that the entanglement between [2] and [3] is also broken.
Given that assumption, it seems possible to determine if particle [1] has been 'forced' into a particular spin, or has been left undisturbed, by testing entanglement between particles [2] and [3].
In a communication situation, an ordered collection of groups of [1] particles would be sent light years away, and then an instrument would incrementally check, groups of corresponding [2] and [3] particles to see if they have been 'forcefully' disturbed or not. If a group of particles is found to have been disturbed (with a reasonable error margin), a 1 bit of data is generated, if not, a 0 bit of data is generated. Much like polling in computer science.
However, I'm well aware that faster than light communication is impossible in physics, so please tell me where I've gone wrong.