On 11/7/2019 6:21 AM, Bruno Marchal wrote:
On 6 Nov 2019, at 10:34, Philip Thrift <cloudver...@gmail.com
<mailto:cloudver...@gmail.com>> wrote:
On Wednesday, November 6, 2019 at 3:19:58 AM UTC-6, Bruno Marchal wrote:
On 5 Nov 2019, at 02:53, Alan Grayson <agrays...@gmail.com
<javascript:>> wrote:
IIUC, as the temperature rises, interference in the double slit
C60 experiment declines, and eventually disappears. I don't
think this is really a which-way experiment because the
interference disappears whether or not which-way is observed.
How does this effect the collapse issue? Usually, IIUC, when
interference ceases to exist, it implies collapse of the wf. So,
is the C60 double slit experiment evidence for collapse of the
wf? TIA, AG
My two pre views posts explained exactly this, in the
non-collapse frame. It works for particles, Molecules and even
macroscopic cats. The advantage of the non-collapse quantum
theory is that any interaction can be counted as a measurement.
So heat cannot not decrease interference, for the technical
factorisation reason already explained.
Bruno
They've sent 2000-atom sized molecules through double slits.
What about sending cats?
You will loss the ability to get the interference, because it is
hugely more complex to isolate a cat from the environment, so its
alive or dead state will be pass on you unavoidably very quickly. See
my explanation to Grayson why any (unknown) interaction of an object
in a superposition state makes it logically impossible to remain in a
superposition relatively to you. It uses only very elementary algebra.
The quantum effect, to be exploited, require perfect isolation, which
is impossible for most macroscopic object. But some
“macro-superposition” have been obtained with superconducting device.
In fact, superconductor is a quantum macroscopic effect.
Aside from the isolation problems the de Broglie wavelength of a cat is
extremely small so to get an interference pattern the slit and slit
spacing must be correspondingly small. The C60 experiment was only made
possible by the development of the Tablot-Lau interferometer.
Brent
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