Re: How to make measurements of a particle



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Topic: Science > Physics
User: "Mike Helland"
Date: 04 Aug 2004 10:55:03 AM
Object: Re: How to make measurements of a particle
Bjoern Feuerbacher wrote:

Mike Helland wrote:

The HUP states that when you measure the position of a particle

with

some degree of certainty your ability to measure the momentum of

that

particle will be limited to another degree of certainty.

The particle being measured can be an electron and the measuring

tool

can be some photons. Right? It thats not right, please correct me.


Essentially right.


Ok, so, can anyone point me to an accessible text on how exactly

how

the measurements are made, all the way through setting up the
experiment, describing what happens, and then ending up with the
numbers?


Irrelevant. This is true for *all* possible measurements.

This follows simply from the wave-particle duality - but can also be
shown more mathematically from Heisenberg's commutation relation

(which

is an axiom of QM).

What do you mean irrelevant?
I'd like to know how to set up the experiment involving an electron and
some light. I'd like to know what happens during the experiment, and
I'd like to know how the measurement follows from that.
I suppose that could be irrelevant to you, but I'm interested in it.
Such experiments do exist, right? All I need is a pointer to them.
.

User: "Bjoern Feuerbacher"

Title: Re: How to make measurements of a particle 04 Aug 2004 11:14:04 AM
Mike Helland wrote:

Bjoern Feuerbacher wrote:

Mike Helland wrote:

[snip]

Ok, so, can anyone point me to an accessible text on how exactly
how
the measurements are made, all the way through setting up the
experiment, describing what happens, and then ending up with the
numbers?


Irrelevant. This is true for *all* possible measurements.

This follows simply from the wave-particle duality - but can also be
shown more mathematically from Heisenberg's commutation relation
(which is an axiom of QM).



What do you mean irrelevant?

Exactly what I said. The details of the measurements are irrelevant
for the outcome. The uncertainty principle is true for *all* possible
measurements.

I'd like to know how to set up the experiment involving an electron and
some light.
I'd like to know what happens during the experiment, and
I'd like to know how the measurement follows from that.

Why? What's so important about that special type of experiment?

I suppose that could be irrelevant to you, but I'm interested in it.
Such experiments do exist, right?

AFAIK, they do.

All I need is a pointer to them.

So Sam Wormley's links did not help?
Bye,
Bjoern
.
User: "Dirk Van de moortel"

Title: Re: How to make measurements of a particle 04 Aug 2004 11:20:47 AM
"Bjoern Feuerbacher" <feuerbac@thphys.uni-heidelberg.de> wrote in message news:cer20c$kkp$1@news.urz.uni-heidelberg.de...

Mike Helland wrote:

Bjoern Feuerbacher wrote:

Mike Helland wrote:


[snip]


Ok, so, can anyone point me to an accessible text on how exactly
how
the measurements are made, all the way through setting up the
experiment, describing what happens, and then ending up with the
numbers?


Irrelevant. This is true for *all* possible measurements.

This follows simply from the wave-particle duality - but can also be
shown more mathematically from Heisenberg's commutation relation
(which is an axiom of QM).



What do you mean irrelevant?


Exactly what I said. The details of the measurements are irrelevant
for the outcome. The uncertainty principle is true for *all* possible
measurements.


I'd like to know how to set up the experiment involving an electron and
some light.
I'd like to know what happens during the experiment, and
I'd like to know how the measurement follows from that.



Why? What's so important about that special type of experiment?



I suppose that could be irrelevant to you, but I'm interested in it.
Such experiments do exist, right?


AFAIK, they do.


All I need is a pointer to them.


So Sam Wormley's links did not help?

I guess pointing to Feynman's Lectures Volume III
wouldn't help either.
Dirk Vdm
.



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