Hello! I came across several papers that use entangled states of 2 ions in a trap to perform measurements with a much higher accuracy than classical (non-entanglement) methods. Here is an example of such a paper where they achieve the best measurement to date of an isotope shift. I was wondering if something similar can be done (or has been done) in diatomic molecules. In that case we already have 2 ions close to each other, so I was wondering if there is a way to entangle the 2 constituents atoms such that you gain some further advantage over normal spectroscopy techniques. Thank you!