Englert–Greenberger duality relation, 2

The most recent work claims that Afshar’s core claim, that the Englert–Greenberger duality relation is violated, is not true. They re-ran the experiment, using a different method for measuring the visibility of the interference pattern than that used by Afshar, and found no violation of complementarity, concluding “This result demonstrates that the experiment can be perfectly explained by the Copenhagen interpretation of quantum mechanics.”

Numerous experiments have shown, however, that any modification of the apparatus that can determine which slit a particle passes through reduces the visibility of interference at the screen, thereby illustrating the complementarity principle: that light (and electrons, etc.) can behave as either particles or waves, but not both at the same time. An experiment performed in 1987 produced results that demonstrated that information could be obtained regarding which path a particle had taken, without destroying the interference altogether. This showed the effect of measurements that disturbed the particles in transit to a lesser degree and thereby influenced the interference pattern only to a comparable extent.

In other words, if one does not insist that the method used to determine which slit each photon passes through be completely reliable, one can still detect a (degraded) interference pattern.

— Wikipedia on Englert–Greenberger duality relation

— Wikipedia on Double-slit experiment

2015.09.22 Tuesday ACHK

如何拯救眾生 1

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The meeting of two personalities is like the contact of two chemical substances: if there is any reaction, both are transformed. — Carl Jung

Generalized Newton’s Third Law: You cannot change others without being changed. — John Wheeler

改變別人時, 你也會被改變. — Me

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You are an A person. You befriend with an F person. The result is that your friend becomes a better person, you become a worse person. In theory, you become a C person. Your friend becomes a C person. In practice, since being a bad person is much easier than being a good person, you two will become both F people. — Me

無友不如己者. — 孔子

Be slow in making friends, slower in changing. — Benjamin Franklin

You have to know how to accept rejection and reject acceptance. — Ray Bradbury

If you hire all A people, he said, they’ll also hire A people. But if you hire B people, they’ll hire the C people and then it’s all over. — Joel Spolsky

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So that means you cannot help anyone weaker than you?

NO.

Instead, you should help others. But you have to help others in a smart way. — Me

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How?

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. . . it is the action of the thinking power called an idea, which an individual may exclusively possess as long as he keeps it to himself; but the moment it is divulged, it forces itself into the possession of every one, and the receiver cannot dispossess himself of it. Its peculiar character, too, is that no one possesses the less, because every other possesses the whole of it. He who receives an idea from me, receives instruction himself without lessening mine; as he who lights his taper at mine, receives light without darkening me.

— Thomas Jefferson

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2008.10.22 Wednesday (c) All rights reserved by ACHK

Can it be Otherwise?

注定外傳 1.5

幾乎所有情況下,在同一個科學求知的任務中,理論(運算)和實驗(觀察)兩者,也是必須的;只是,在不同的任務,兩者的比重不同而已。

一方面,不可能只有理論而完全沒有實驗。即使沒有直接實驗,也必定有間接的實驗成份。試想想,那些理論從何而來?

不就是從無數的觀察和實驗中,歸納出來嗎? 

即使有些理論,真的來自靈感,不是來自實際,那個理論提出來以後,你又怎麼知道,正不正確,可不可靠呢?

未經證實的理論,只是「猜想」,不是「理論」。能經得起實際考驗的,才能升格為「理論」。

另一方面,不可能只有實驗而完全沒有理論。即使沒有直接理論,也必定有間接的理論成份。

試想想,那些實驗儀器,如何建造,從何而來?

不就是建基於,已知的理論嗎?

– Me@2015-09-22 07:41:07 AM

2015.09.22 Tuesday (c) All rights reserved by ACHK