The Arado 234 C3 was a proposal for a Fi 103/V1 carrier late in the war, when the Lufwaffe high command was searching for a faster aircraft to deliver the V1.
It's what is refered to as a proposal/paper project, as no Arado 234 ever carried a V1 piggy backed. So, in fact it is Luft '46, but no fantasy. As it was a subject of research during WW2. As a matter of fact, the Arado Ar 234 C3 was more or less in the prototype stage at the end of the war, to give it more power bij coupling 2x2 Jumo 004 B engines.
This was investigated for several projects, among them the Ju 287 as the proposed Jumo 004 C's devolopment (a higher rated 004 B) was not comming to frutation in time.
Therefore several other powerplants were investigated, among them even a triple BMW engine to get a higher output propolsion source for jet aircraft.
The only wide operational use of V1 carrier aircraft was the He 111, even though several other aircraft were tested.