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In recent years an increasing number of papers attempt to mimic or supplantquantum field theory in discussions of issues related to gravity by the toolsand through the perspective of quantum information theory, often in the contextof alternative quantum theories. In this essay, we point out three commonproblems in such treatments. First, we show that the notion of interactionsmediated by an information channel is not, in general, equivalent to thetreatment of interactions by quantum field theory. When used to describegravity, this notion may lead to inconsistencies with general relativity.Second, we point out that in general one cannot replace a quantum field by thatof classical stochastic sources, or mock up the effects of quantum fluctuationsby classical noises, because in so doing important quantum features such ascoherence and entanglement will be left out. Third, we explain how underspecific conditions semi-classical and stochastic theories indeed can beformulated from their quantum origins and play a role at certain regimes ofinterest.

Gravity, Quantum Fields and Quantum Information: Problems with classical channel and stochastic theories