Quantum field theory cannot provide faster-than-light communication

@article{Eberhard1989QuantumFT,
  title={Quantum field theory cannot provide faster-than-light communication},
  author={Philippe Eberhard and Ronald R. Ross},
  journal={Foundations of Physics Letters},
  year={1989},
  volume={2},
  pages={127-149}
}
We spell out a demonstration that, within the framework of quantum field theory, no faster-than-light communication can be established between observers. The steps of the demonstration are detailed enough to pinpoint which properties of the theory have been misinterpreted in previous papers claiming the existence of effects that could permit such communication. The developments described here can also be used to analyze future papers making similar claims. 
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