Faster than light communication?

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SUMMARY

The discussion centers on the concept of using entangled photons and polarization filters to explore the possibility of faster-than-light communication. The proposed method involves sending one photon of an entangled pair through a polarization filter while storing the other. The outcome of the measurement on the received photon would dictate the state of the stored photon, potentially allowing for instantaneous information transfer. However, the feasibility of this method is questioned, particularly regarding the implications of quantum mechanics and the nature of measurement.

PREREQUISITES
  • Quantum entanglement and its implications
  • Polarization filters and their function in quantum measurement
  • Quantum state measurement and its effects
  • Error-correction techniques in quantum communication
NEXT STEPS
  • Research the principles of quantum entanglement and Bell's theorem
  • Study the mechanics of polarization filters in quantum optics
  • Explore quantum error correction methods and their applications
  • Investigate the implications of quantum measurement on information theory
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Physicists, quantum computing researchers, and anyone interested in the theoretical aspects of quantum communication and its limitations.

Aphex_Twin
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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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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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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")?
 

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