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We review the recent confirmation of quantum entanglement in e+ e- collisionsat the BELLE experiment at KEK-B in Japan with neutral B- mesons, and at theKLOE experiment at the DAFNE in Italy with neutral K- mesons. Such effects inthe latter system seen already in proton-antiproton collisions by the CPLEARexperiment are also reviewed for purposes of comparison. In addition, the KLOEexperiment provides new tests of the CPT theorem and are briefly discussed.

Research News -- Quantum Mechanical Entanglement and Tests of CPT Theorem with Neutral Mesons at e+ e- Colliders