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Recently, there has been a lot of attention and studies on treating high-energy colliders as natural quantum processors.
Along these lines, we propose a novel test of quantum mechanics which goes beyond the Bell-inequality test.
Our proposal is based on the Quantum Process Tomography, i.e. an experimental reconstruction of the entire quantum channel.
We demonstrate such a test can be implemented with the e+ e- > t tbar process at lepton colliders with multiple runs of different beam polarisation settings.
We also discuss the possibilities of Quantum Process Tomography with different collider processes.