For entangled muon pairs, spin-measurement and decay-direction correlations are independent of the measurement order, and this is explained within standard quantum mechanics without retrocausality.
Can Future Observation of the Living Partner Post-tag the Past Decayed State in Entangled Neutral K-Mesons ?
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Entangled neutral K-mesons allow 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.
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Time, quantum entanglement, and particle decay
For entangled muon pairs, spin-measurement and decay-direction correlations are independent of the measurement order, and this is explained within standard quantum mechanics without retrocausality.