The current experiments use such a small number of photons that it would take a standard laptop a fraction of a second to make the same calculation. (sciencemag.org)
When the system reaches equilibrium, the same number of photons will leave the gas column as enter. (realclimate.org)
Their example of a difficult certification problem is sorting a defined number of photons after they have gone through a defined arrangement of several optical elements. (sciencedaily.com)