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Faster than light communication?

  1. Jan 16, 2005 #1
    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?
  2. jcsd
  3. Jan 16, 2005 #2
    https://www.physicsforums.com/journal.php?s=&action=view&journalid=13790&perpage=10&page=2 [Broken]

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

    Last edited by a moderator: May 1, 2017
  4. Jan 16, 2005 #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")?
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