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...ed by [[Hippolyte Louis Fizeau]] in 1849. And now Maxwell had shown that [[electromagnetic wave]]s propagate with exactly the same speed.

...communication. Today this process almost always involves the sending of [[electromagnetic wave]]s by electronic transmitters but in earlier years it may have involved the

...ed by [[Hippolyte Louis Fizeau]] in 1849. And now Maxwell had shown that [[electromagnetic wave]]s propagate with exactly the same speed.

In the classical theory of optical coherence, light is modelled as an electromagnetic wave, and correlations are observed and analyzed up to the ''second order'', con