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I consider the role of detection noise in quantum-enhanced metrology incollective spin systems, and derive a fundamental bound for the maximumobtainable sensitivity for a given level of added detection noise. I thenpresent an interaction-based readout utilising the commonly used one-axistwisting scheme that approaches this bound for states generated via severalcommonly considered methods of generating quantum enhancement, such as one-axistwisting, two-axis counter-twisting, twist-and-turn squeezing, quantumnon-demolition measurements, and adiabatically scanning through a quantum phasetransition. I demonstrate that this method performs significantly better thanother recently proposed interaction-based readouts. These results may helpprovide improved sensitivity for quantum sensing devices in the presence ofunavoidable detection noise.

physical review. a/physical review, a

Using Interaction-Based Readouts to Approach the Ultimate Limit of  Detection Noise Robustness for Quantum-Enhanced Metrology in Collective Spin  Systems