Entangled neutral K mesons allow for the study of their correlated dynamics at interference and decoherence times not accessible in any other system. We find novel quantum phenomena associated to a correlation in time between the two partners: The past state of the first decayed kaon, when it was entangled before its decay, is post-tagged by the result and the time of the future observation of the second decay channel. This surprising ``from future to past'' effect is fully observable and leads to the unique experimental tag of the KS state, an unsolved problem since the discovery of $CP$ violation.
No takes yet. Share an insight, caveat, or question.
Bernabéu et al. (2022) studied this question.