  Measure equivalence was introduced by Gromov as a measured analogue of
quasi-isometry. Unlike the latter, measure equivalence does not preserve the
large scale geometry of groups and happens to be very flexible in the amenable
world. Indeed the Ornstein-Weiss theorem shows that all infinite countable
amenable groups are measure equivalent to the group of integers. To refine this
equivalence relation and make it responsive to geometry, Delabie, Koivisto, Le
Ma\^itre and Tessera introduced a quantitative version of measure equivalence.
They also defined a relaxed version of this notion called quantitative measure
subgroup coupling. In this article we offer to answer the inverse problem of
the quantification (find a group admitting a measure subgroup coupling with a
prescribed group with prescribed quantification) in the case of the lamplighter
group.
