Re: FTL Quantum Comm. via 2-photon Interference?

From: danek (danek@ll.mit.edu)
Date: 03/06/03 

From: danek <danek@ll.mit.edu>
Date: Thu, 06 Mar 2003 08:30:45 -0500

I am not an expert on QM but I am struggling with these ideas myself. I would think that
probability theory applies to an entangled photon pair before any measurement takes place.
However, after you measure one photon then you know for certain what the other photon is.
For instance, you generate one pair of photons that are entangled in polarization. The
photons are orthogonal to each other. Once the photons are generated you can separate them
from each other and send them down different paths. One of the two goes to a detector and
gets measured. Before the measurement takes place there is a fifty fifty chance you know
the polarization of the photon heading to your detector. Once you have detected that photon
you now know the polarization of both photons even though you never measured the second
one. This is what makes it different from Aliens flipping coins. The coins aren't
entangled.

P. Danek

Thinh Tran wrote:

> "Douglas A. Gwyn" <DAGwyn@null.net> wrote in message news:<3E65AD2E.4040808@null.net>...
>
> > Thus, if probabilities aren't involved, what
> > is it? Degree of entanglement?
>
> [Reply] Sorry. I didn't see this question the last time. According to
> my findings, there is no need for probability because you are dealing
> with distributions. Distributions can explain everything that QM is
> explaining right now with probability.
> Probability: Starting from the parts, moving to the whole.
> Distribution: Starting from the whole, sometimes can move to the
> parts.
> That's a big difference.
> Thinh Tran (http://www.thinhtran.com)

Relevant Pages

  • Re: Proof that macintosh is better than VMS
    ... Note that Ehrenfest's theorem shows how quantum ... randomness (or as I prefer to put it, the probability) is almost ... And the energy in each photon ... I don't see any way out of this other than intrinsic probability. ...
    (comp.os.vms)
  • Re: Proof that macintosh is better than VMS
    ... Quantum Gravity theorems are still extremely speculative eg Loop quantum ... randomness (or as I prefer to put it, the probability) is almost ... And the energy in each photon ... I don't see any way out of this other than intrinsic probability. ...
    (comp.os.vms)
  • Re: Teleportation of photons using entanglement
    ... experiment and a non-technical article describing quantum entanglement. ... Suppose further that an arbitary photon, call it P, ... The experimental apparatus then effectively performs a quantum ... But before the measurement, A and B were in an entangled state |s>, so ...
    (sci.physics.research)
  • Re: Bras, kets etc.
    ... every measurement establishes a valid underlying ... It is just a probability calculation tool. ... array or CCD to measure the power incident on each pixel. ... know that the other photon has the same polarity ...
    (sci.physics)
  • Re: A Look at Quantum "Spookiness"
    ... polarization angle of one of the "paired photons" were changed, ... not in any individual measurement. ... known at another point connected by quantum entanglement. ... photon was vertically polarised), he merely measured it. ...
    (sci.physics.particle)