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We show that the operational definition of non-classicality of a quantumstate depends on the motion of the observer. We use the relativisticUnruh-DeWitt detector model to witness nonclassicality of the probed fieldstate. It turns out that the witness based on the properties of theP-representation of the quantum state depends on the trajectory of thedetector. Inertial and noninertial motion of the device have qualitativelydifferent impact on the performance of the witness.

Effect of relativistic motion on witnessing non-classicality of quantum states