I think I understand it.

I have just read this article on the Seti website, I found it interesting.

Quantum Astronomy: The Double Slit Experiment (link)

This is a series of four articles each with a separate explanation of
different quantum phenomena. Each of the four articles is a piece of a mosaic
and so every one is needed to understand the final explanation of the quantum
astronomy experiment we propose, possibly using the Allen
Array Telescope and the narrow-band radio-wave detectors being build by the
SETI Institute and the University of California, Berkeley.

This article had some interesting information too Brainy Brethren Is there really life out there?