This article is an extended version of the article “The double-slit experiment” that appeared in the September 2002 issue of Physics World (p15). It has been further extended to include three letters ...

Figure 1: Experimental set-up (main figure) and relevant levels, transition wavelengths, and linewidths of Ba + (inset). As we will show below, there is the much deeper implication of a back-action on ...

Optical interference is not only a fundamental phenomenon that has enabled new theories of light to be derived, but it has also been used in interferometry for the measurement of small displacements, ...