Abstract
An analysis made in a recent publication indicates that two-photon, Raman, and thermal excitation noise contributions in a 10-μm infrared quantum counter (IRQC) are insignificant compared to that due to the background (300 K) radiation. This conclusion is found to be unwarranted because of several errors in the analysis, foremost of which is an overestimation by 9 orders of magnitude of the transition rate Wα′αbir induced by background radiation. The revised calculation presented here demonstrates that the background radiation, far from being the dominant noise source, is at most comparable in magnitude with the other noise mechanisms.
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