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Natural Science Forum / Physics / Particle Physics / January 2006



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simultaneous wave/particle detection article

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chan - 21 Jan 2006 12:35 GMT
I've been searching for this article about simultaneous observation of
wave and particle in an experiment made last year or but can't find it.
Who
are the experimenters again? Is it a double slit? Complementary law
says
only wave or particle can be seen one at a time but not both. However,
the
experiment is said to detect them both. If true. What is the relevance
to
the concept of superposition where the particle doesn't exist and no
values
before measurement?

chan
Sam Wormley - 21 Jan 2006 16:20 GMT
> I've been searching for this article about simultaneous observation of
> wave and particle in an experiment made last year or but can't find it.
[quoted text clipped - 5 lines]
>
> chan

See: http://nobelprize.org/physics/articles/ekspong/
The Wave-Particle Duality in One and the Same Experiment

   Experiments with beams of light or of electrons have been made
   such that both aspects - waves and particles - are observed.

Entanglement: The Greatest Mystery in Physics
Amir D Aczel
2002 John Wiley & Sons/Four Walls Eight
Windows 302pp 16.99/$28.00hb

There are two kinds of books about quantum
mechanics. There are those in which we learn
about abstract concepts such as Hilbert spaces,
state vectors and density matrixes, but where the
author never addresses - or only pays lip-service
to - the question of what quantum mechanics
actually means. This is the approach often taken in
textbooks. The other, quite opposite, approach
focuses on the interpretative question - drawing all
kinds of conclusions and analogies, talking about
telepathy and other mysteries, and perhaps even
claiming that quantum mechanics transcends
Western philosophy.

Neither approach is very helpful when one wants
to understand what quantum mechanics really
means in a deep philosophical sense. Amir Aczel's
new book on entanglement - falling as it does into
neither category - avoids such pitfalls.

Anton Zeilinger from the Institute of Experimental
Physics at the University of Vienna reviews the
book in the May issue of Physics World; email
anton.zeilin...@univie.ac.at
chan - 21 Jan 2006 22:33 GMT
No. I'm looking for that experiment where they can detect the particle
in
flight as well as the wave destroying the principle of complementary.
I read the book you mentioned a year ago. The experiment I'm looking
for is more recent. I can't find it.

chan

> > I've been searching for this article about simultaneous observation of
> > wave and particle in an experiment made last year or but can't find it.
[quoted text clipped - 41 lines]
> book in the May issue of Physics World; email
> anton.zeilin...@univie.ac.at
Sam Wormley - 22 Jan 2006 01:18 GMT
> No. I'm looking for that experiment where they can detect the particle
> in flight as well as the wave destroying the principle of complementary.
> I read the book you mentioned a year ago. The experiment I'm looking
> for is more recent. I can't find it.

Well then the following is probably not what you are looking for.

Number 754 #1, November 16, 2005 by Phil Schewe and Ben Stein

Hyper-Entangled Photon Pairs
  http://www.aip.org/pnu/2005/split/754-1.html

    Physicists at the University of Illinois at Urbana-Champaign have
    demonstrated for the first time the entanglement of two objects not
    merely in one aspect of their quantum natures, such as spin, but in
    a multitude of ways.

    Entanglement is the quantum affinity between or among particles
    (such as atoms or photons) in which the measurement of some
    property for one particle automatically and instantaneously
    determines the corresponding property of the other particle.

    Take the case of two photons entangled with respect to
    polarization, the orientation of the electric field associated with
    the photon. The photons, until detected, have no spin orientation;
    this is the principle of quantum indeterminacy. Indeed, both
    photons are said to be in a superposition of arbitrary -- but
    parallel -- polarization states. Consequently, each photon has a 50
    percent likelihood of being measured to have any polarization state
    -- e.g., +45 or -45 degrees. If now one photon's polarization is
    measured to be +45, then its entangled twin will surely also be
    polarized along +45, owing to the way the photons are made in this
    setup.

    One of the chief hopes of entanglement research is to exploit the
    superposition idea and the entanglement idea for performing
    unusually fast quantum computation. In the Illinois experiment, two
    photons, produced in a "down-conversion" process whereby one photon
    enters an optical crystal and sunders into two lesser-energy
    correlated daughter photons, are entangled not just in terms of
    polarization, but also in a number of other ways: energy, momentum,
    and orbital angular momentum (see PNU 721).

    Actually, the photon pair can be produced in either of two
    crystals, and the uncertainty in the production details of the
    individual photons is what provides the ability to attain
    entanglement in all degrees of freedom.

    Is it better to entangle two particles in ten ways or ten particles
    in two ways? They're probably equivalent, says Paul Kwiat, leader
    of the Illinois group, but for the purpose of quantum computing or
    communication it might be of some advantage if multiple quantum
    bits (or qubits) of information can be encoded in a single pair of
    entangled particles. Kwiat (217-333-9116, kwiat@uiuc.edu) says that
    his lab detects a record two million entangled photon pairs per
    second with ample determination of numerous properties, allowing a
    complete characterization of the entanglement produced.
chan - 22 Jan 2006 01:40 GMT
oh, i found it, it's the Afshar experiment which shows light can behave
as particle and wave at the SAME time potentially killing Copenhagen
and
Many Worlds Interpretation and supporting Transactional Interpretation,

which describes each quantum process as a handshake between a
normal "offer" wave (_) and a back-in-time advanced "confirmation" wave
(_*)

http://www.sciencefriday.com/images/shows/2004/073004/AfsharExperimentSmall.jpg

http://www.irims.org/quant-ph/030503/Afshar%20Complementarity%20All.PDF

http://www.analogsf.com/0409/altview2.shtml

> > No. I'm looking for that experiment where they can detect the particle
> > in flight as well as the wave destroying the principle of complementary.
[quoted text clipped - 53 lines]
>      second with ample determination of numerous properties, allowing a
>      complete characterization of the entanglement produced.
Autymn D. C. - 23 Jan 2006 14:22 GMT
Liht always behaves like a wave, because it is.  That it has
directionality threatens nothing.
Maarten van Reeuwijk - 23 Jan 2006 15:02 GMT
> oh, i found it, it's the Afshar experiment which shows light can behave
> as particle and wave at the SAME time potentially killing Copenhagen
[quoted text clipped - 4 lines]
> normal "offer" wave (_) and a back-in-time advanced "confirmation" wave
> (_*)

http://www.sciencefriday.com/images/shows/2004/073004/AfsharExperimentSmall.jpg

> http://www.irims.org/quant-ph/030503/Afshar%20Complementarity%20All.PDF
>
> http://www.analogsf.com/0409/altview2.shtml

Strange, a quick search on the web shows that he is currently associated
with the Rowan university:

http://users.rowan.edu/~afshar/,

But I cannot find any peer reviewed articles under his name on the web of
science? That's a bit odd for a professor?

Furthermore, the preprint is from 2003 and it has not been published yet?
Have there been some problems in getting it accepted?

Just curious,

Maarten

Signature

===================================================================
Maarten van Reeuwijk                    dept. of Multiscale Physics
Phd student                             Faculty of Applied Sciences
maarten.ws.tn.tudelft.nl             Delft University of Technology

Schoenfeld - 23 Jan 2006 14:30 GMT
> No. I'm looking for that experiment where they can detect the particle
> in
> flight as well as the wave destroying the principle of complementary.
> I read the book you mentioned a year ago. The experiment I'm looking
> for is more recent. I can't find it.

You must be talking about Afshar's experiment.
Mike - 23 Jan 2006 15:07 GMT
> No. I'm looking for that experiment where they can detect the particle
> in
[quoted text clipped - 3 lines]
>
> chan

Wormhead is a cut & paster fulltime. He doesn't even read the posts, he
just pastes his crap which he doesn't understand by the way because he
never studied physics.

You will find a lot of information here:

http://www.wordiq.com/definition/Afshar_experiment

Which you will fail to understand as well.

Mike

> > > I've been searching for this article about simultaneous observation of
> > > wave and particle in an experiment made last year or but can't find it.
[quoted text clipped - 41 lines]
> > book in the May issue of Physics World; email
> > anton.zeilin...@univie.ac.at
 
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