  The use of multi-particle entangled states has the potential to drastically
increase the sensitivity of atom interferometers and atomic clocks. The
Twist-and-Turn (TNT) Hamiltonian can create multi-particle entanglement much
more rapidly than ubiquitous one-axis twisting (OAT) Hamiltonian in the same
spin system. In this paper, we consider the effects of detection noise - a key
limitation in current experiments - on the metrological usefulness of these
nonclassical states and also consider a variety of interaction-based readouts
to maximize their performance. Interestingly, the optimum interaction-based
readout is not the obvious case of perfect time reversal.
