[JBits]

I know about the conventional 2-qubit Molmer-Sorensen but not the 5-qubit version. Could I ask what it is?

[reikonomusha]

See e.g. equations (5) and (6) from [1], where any qubit subset of a system might undergo the action of the M–S gate. But definitely the usual presentation of the physics of M–S is on a two qubit system.

[1] https://arxiv.org/abs/1601.06819