One recent experiment backs up Minkowski's answer — but still may not prove Abraham wrong. One might expect that the momentum of a photon, under almost any conditions, would no longer be a ...

This includes linear momentum, which is what ... But that increases the energy carried by each photon, ruling out atoms as reliable targets. In the new experiment, the researchers, who included ...

Since it was first demonstrated in the 1960s, spontaneous parametric down-conversion (SPDC) has been at the center of many quantum optics experiments ... momentum compared to the input photon ...