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
> 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
> 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.
> 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