General quantum measurements in relativistic quantum field theory

Single particle detection is described in a limited way by simple models of measurements in quantum field theory. We show that a general approach, using Kraus operators in spacetime constructed from natural combinations of fields, leads to an efficient model of a single particle detector. The model is free from any auxiliary objects as it is defined solely within the existing quantum field framework. It can be applied to a large family of setup where the time resolution of the measurement is relevant, such as Bell correlations or sequential measurement. We also discuss limitations and working regimes of the model.

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