Inhalt Atome als Quantenmechnische Teilchen Wiederholung Interferenz und Doppelspalt, Paradoxien, Delayed Choice, Quantenradierer Doppelspaltversuche mit Teilchen: Elektronen Atome, Moleküle Dekohärenz: Teilchenstreuung, Lichtstreuung, thermische Emission Beispiel H 2 Quantenkryptographie - PowerPoint PPT Presentation
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Inhalt1. Atome als Quantenmechnische Teilchen
1. Wiederholung Interferenz und Doppelspalt, Paradoxien, Delayed Choice, Quantenradierer2. Doppelspaltversuche mit Teilchen:
1. Elektronen2. Atome, Moleküle
3. Dekohärenz: Teilchenstreuung, Lichtstreuung, thermische Emission4. Beispiel H2
Does this result mean that present choice influences past dynamics,in contravention of every formulation of causality? Or does it mean, calculate pedantically and don’t ask questions? Neither;the lesson presents itself rather like this, that the past has no existence except as it is recorded in the present.
Wheeler, J. A., [1978], The Past and the Delayed-Choice Double-slit Experiment,in Mathematical Foundations of Quantum Theory, ed. Marlow,pp. 9-47, Academic Press, New York.
Wheeler, Delayed Choice:
Does this result mean that present choice influences past dynamics,in contravention of every formulation of causality? Or does it mean, calculate pedantically and don’t ask questions? Neither;the lesson presents itself rather like this, that the past has no existence except as it is recorded in the present.
Wheeler, J. A., [1978], The Past and the Delayed-Choice Double-slit Experiment,in Mathematical Foundations of Quantum Theory, ed. Marlow,pp. 9-47, Academic Press, New York.
Echter Doppelspalt schwierig:
Elektron 100eV
1.2*10-10 m
1.2..Interferenz von Teilchen1.2.1.: Möllenstedt/Düker (1956): Doppelspalt mit Elektronen
"We should say right away that you should not try to set up this experiment. This experiment has never been done in just this way. The trouble is that the apparatus would have to be made on an impossibly small scale to show the effects we are interested in. We are doing a "thought experiment", which we have chosen because it is easy to think about. We know the results that would be obtained because there are many experiments that have been done, in which the scale and the proportions have been chosen to show the effects we shall describe".
Feynman Lectures:"We choose to examine a phenomenon which is impossible, absolutely impossible, to explain in any classical way, and which has in it the heart of quantum mechanics. In reality, it contains the only mystery."
1.2..Interferenz von Teilchen1.2.1.: Möllenstedt/Düker (1956): Doppelspalt mit Elektronen Jönsson: echter Doppelspalt 1957
1 Young's double-slit experiment applied to the interference of single electrons
2 Galileo's experiment on falling bodies (1600s)
3 Millikan's oil-drop experiment (1910s)
4 Newton's decomposition of sunlight with a prism (1665-1666)
5 Young's light-interference experiment (1801)
6 Cavendish's torsion-bar experiment (1798)
7 Eratosthenes' measurement of the Earth's circumference (3rd century BC)
8 Galileo's experiments with rolling balls down inclined planes (1600s)
9 Rutherford's discovery of the nucleus (1911)
10 Foucault's pendulum (1851)
Physics World Sept 2002Top 10 beautiful experiments
Echter Doppelspalt schwierig:
Elektron 100eV
1.2*10-10 m
1.2.1.. Möllenstedt/Düker (1956): Doppelspalt mit Elektronen
reale Lichtquelle
Fresnel Biprisma
2 kohärenteVirtuelle Lichtquellen
1.2.1.. Möllenstedt/Düker (1956): Doppelspalt mit Elektronen
1.2.1.. Möllenstedt/Düker (1956): Doppelspalt mit Elektronen
reale Lichtquelle
Analogon zum Doppelspalt
Möllenstedt/Düker (1956): Doppelspalt mit Elektronen