  We present a scheme for creating macroscopic superpositions of the direction
of superfluid flow around a loop. Using the Bose-Hubbard model we study an
array of Bose-Einstein condensates trapped in optical potentials and coupled to
one another to form a ring. By rotating the ring so that each particle acquires
on average half a quantum of superfluid flow, it is possible to create a
multiparticle superposition of all the particles rotating and all the particles
stationary. Under certain conditions it is possible to scale up the number of
particles to form a macroscopic superposition. The simplicity of the model has
allowed us to study macroscopic superpositions at an atomic level for different
variables. Here we concentrate on the tunnelling strength between the
potentials. Further investigation remains important, because it could lead us
to making an ultra-precise quantum-limited gyroscope.
