Test of quantum nonlocality via vector meson decays to KSKS.

In the system of a pair of quantum-entangled neutral kaons from meson decays, when one kaon collapses into the K S state, the other will collapse instantaneously into the K L state, due to entanglement and nonlocality. However, if the alternative hypothesis is correct and there is a time window during which one kaon is unaware that the other has decayed, some quantum mechanically prohibited K S K S decays may occur. We calculate the branching ratios of K S K S in vector meson decays under locality hypothesis and compare them with experimental results. We show that the branching ratio of J / ψ → K S K S under locality assumption is already excluded by the BESIII experimental upper limit. Additional experimental results are proposed to perform this test in the future. [ABSTRACT FROM AUTHOR]