Re: Quantum Illumination

On Jan 24, 2:33 pm, Erik Max Francis <m...@xxxxxxxxxxx> wrote:
n...@xxxxxxx wrote:
http://www.sciam.com/article.cfm?id=quantum-entanglement

  starts off fairly clever-sounding, about using entangled photons for
illuminating targets so as to eliminate confusion from extraneous,
unentangled photons (think radar).

  But typical of quantum topics it rapidly turns weird. Apparently, to
get the most benefit from using entangled photons the entanglement
must be destroyed before the reflected photons are received.

  Now granted that if one thinks they understand QM they are wrong,
but how are we to grok this?

  Is this the path to SF "sensors" capable of tricks not possible with
ordinary EM?

  Or is this just the new  macguffin?

The article indicates it's a new theoretical conclusion based on
calculations that hasn't been completely accepted, much less
demonstrated in the real world yet.  The article doesn't really even go
into detail about what the actual effect is that's being discussed, not
that that's a huge surprise.

Worse, the author actually states he came up with this to keep the
DARPA money flowing, so I was afraid it was sheerest grantology.

I think I'll run it past sci.physics and see if anybody has any
insights.


Mark L. Fergerson
.

Relevant Pages

  • Re: twins versus quanta collapse
    ... Along path A a string of entangled photons is detected ... we register a sequel of outcomes. ... the detection of one of the two should not ...
    (sci.physics.relativity)
  • Re: twins versus quanta collapse
    ... Along path A a string of entangled photons is detected ... After many attempts the statistic fits the wave function ... nature of all quantum objects. ...
    (sci.physics.relativity)
  • Re: Has FTL communication really never been tested in this way?
    ... a "clean source" of entangled photons. ... The measurement on the idler so-to-say ... If you want to measure the two-photon interference, ...
    (sci.physics.research)
  • Re: Delayed choice experiment and interstellar signalling
    ... Those photons ... create an interference pattern that looks like particles, not waves, ... In the delayed choice quantum erasure experiment they're using spontaneous parametric down conversion to create the entangled photons, so the phase of the incoming photons is lost. ...
    (sci.space.policy)
  • Re: Quantum Illumination
    ... illuminating targets so as to eliminate confusion from extraneous, ... unentangled photons (think radar). ... get the most benefit from using entangled photons the entanglement ...
    (rec.arts.sf.science)