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Constraints on the quantum decoherence of entangled $\gamma$ quanta at theMeV scale, such as those produced following positron annihilation, haveremained elusive for many decades. We present the first accurate, largeacceptance experimental data for triple Compton scattering (TCS) of suchentangled $\gamma$. An entanglement witness, the enhancement ($R$) of theazimuthal correlation between the final CS planes, is obtained where one of the$\gamma$ underwent intermediate Compton scattering (CS). $R$ is found to exceedthe classical limit for scatter angles up to $\sim$40$^{\circ}$. The extracted$R$, over the range of the data ($0-70^{\circ}$), are better described bysimple models in which entanglement is conserved or decohered proportional tothe visibility of the scatter process. The work will help guide the developmentof a first theoretical description of decoherence at the MeV scale, a crucialnext step for fundamental physics and entangled PET medical imaging.

A first detailed study of the quantum decoherence of entangled gamma photons