Faster than light communication?

In summary, The conversation discusses the concept of using entangled photons and polarization filters to potentially enable near-instantaneous transmission of information. It involves separating pairs of entangled photons into two streams, storing one while sending the other, and then measuring them at a later time to determine the quantum state. The question at hand is whether this process could be physically possible and how it differs from using a red filter to change the color of light.
  • #1
Aphex_Twin
39
0
I was thinking of something:

Say we have pairs of entangled photons. Say we send these through a polarization filter. We can call the output "ones". Now, we separate the pairs into two streams (through two optic cables). We store one member of the pair (without measuring it) and send the other down the wire. Now, after some time, the receiver of the photons would chose wether or not to measure the photons received. If he makes a measurement then the particle will either change it's quantum state or not (it will flip to a random state). If the quantum state is changed we will have a "zero". Shortly after, the transmitter would start measuring the photons it had stored. The receiver then screens for the "zeros". If coordination is very good and error-correction is applied, this should allor for near-instantaneous transmission of information from the "receiver" to the "transmitter". Would this be physically possible?
 
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  • #2
https://www.physicsforums.com/journal.php?s=&action=view&journalid=13790&perpage=10&page=2

Read the "no faster then light communication"-entry. Just think that the outcomes after polarization are represented by spins here...

marlon
 
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  • #3
If we pass a ray of white light through a red piece of plastic (filter), the outcome will be red light, but the light would not be essentially diferent, only at a reduced number of wavelengths. Can someone explain how is the polarization filter diferent (in acting like a "measurement device")?
 

What is faster than light communication?

Faster than light communication refers to the hypothetical ability to transmit information or messages faster than the speed of light, which is considered the universal speed limit according to the theory of relativity. This concept is still a subject of debate and has not been proven to be possible.

Is faster than light communication possible?

At this point, there is no scientific evidence to support the possibility of faster than light communication. The theory of relativity, which has been extensively tested and proven, states that the speed of light is the maximum speed at which all matter and information can travel.

What are some proposed methods for faster than light communication?

Some proposed methods for faster than light communication include quantum entanglement, wormholes, and tachyons. However, these concepts are still in the realm of theoretical physics and have not been proven to be feasible.

What are the potential implications of faster than light communication?

If faster than light communication were to be possible, it would challenge our understanding of the laws of physics and could potentially revolutionize communication and transportation technologies. It could also have significant implications for space exploration and our understanding of the universe.

Are there any experiments being conducted to test faster than light communication?

While there have been some attempts to test the concept of faster than light communication, none have been successful. Scientists continue to explore the possibilities and limitations of this concept, but for now, it remains a hypothetical and unproven idea.

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