"The basic element of quantum theory is the double-slit experiment. It is 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 ... the basic peculiarities of all quantum mechanics." - Richard Feynman

Everyone is familiar with the traditional Double Slit Experiment, if you start with a electron, which everyone immediately imagines or thinks of a 'particle', which then passes through a double slit, an interference pattern is formed, as if the particle asks as a wave and passes through both slits.

Hence the duality of the electron, particle or wave.....

The question is what happens if you 'remove' the electron, to infinity for example or behind a 'quantum barrier', or inside a black hole as in the case of Hawking radiation (but that's another story).

You still have an electron, but instead of thinking of a 'particle electron' you have to only imagine a 'quantum electron', that is, there is a finite probability that an 'electron' probability distribution exists somewhere in the experimental frame of reference.

Once you remove the concept of a 'particle electron' the duality immediate disappears.

The experiment simply becomes a probability distribution, which can pass through the double slits causing an interference pattern, as expected.

As they say a picture paints a thousand words....

Kind Regards

Terry Giblin