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We show that free-space diffraction of photons distributes highly usefulentanglement: the receivers of the propagated modes can do a distributedquantum computation using only linear optics and photon counting. Thedistributed computation requires classical communication between receivers,however, similar to standard measurement-based computation, that communicationis of purely random outcomes and so can be indistinguishable from noise. Thespeculation in the title arises from the further observation that the naturalway for a circumspect civilization to hide their photonic entanglementdistribution is to use the thermal light already being emitted from the variousstars they visit. This requires them knowing the number of photons in the modesthey have chosen to use, and as such they would need to perform a quantumnon-demolition measurement of photon number. Because the thermal light they aremeasuring is diagonal in the number basis even this process can be rendered inprinciple indiscernible to those of us excluded from the conversation.

Perhaps they are everywhere? Undetectable distributed quantum  computation and communication for alien civilizations can be established  using thermal light from stars