A team of researchers conducted an in-depth study of magnetic quasiparticles called 'triplons.' The team conducted the study with a low-dimensional quantum magnet, Ba2CuSi2O6Cl2, using neutron inelastic scattering by AMATERAS at J-PARC. Their findings lead to the discovery of a new 'topologically protected triplon edge state' in the aforementioned compound.