  We expand the Bethe/Gauge dictionary between the XXX Heisenberg spin chain
and 2d N = (2,2) supersymmetric gauge theories to include aspects of the
algebraic Bethe ansatz. We construct the wave functions of off-shell Bethe
states as orbifold defects in the A-twisted supersymmetric gauge theory and
study their correlation functions. We also present an alternative description
of off-shell Bethe states as boundary conditions in an effective N = 4
supersymmetric quantum mechanics. Finally, we interpret spin chain R-matrices
as correlation functions of Janus interfaces for mass parameters in the
supersymmetric quantum mechanics.
