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The use of multi-particle entangled states has the potential to drasticallyincrease the sensitivity of atom interferometers and atomic clocks. TheTwist-and-Turn (TNT) Hamiltonian can create multi-particle entanglement muchmore rapidly than ubiquitous one-axis twisting (OAT) Hamiltonian in the samespin system. In this paper, we consider the effects of detection noise - a keylimitation in current experiments - on the metrological usefulness of thesenonclassical states and also consider a variety of interaction-based readoutsto maximize their performance. Interestingly, the optimum interaction-basedreadout is not the obvious case of perfect time reversal.

Robustifying Twist-and-Turn Entanglement with Interaction-Based Readout