2/ Operating temperature: A significant logistical advantage is that photons retain their quantum properties at room temperature. As a result, PQC systems don't need to be cooled to cryogenic temperatures (like many other QC architectures), which greatly reduces the implementation effort.

2.5/ (Notice: We will most likely have to cool the photodetectors that are ultimately used in PQC systems. And when in the end the whole PQC system is integrated on a single chip, the whole chip therefore has to be cooled, but that's another story.)