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

摘要

We consider the role of detection noise in quantum-enhanced metrology in collective spin systems, and derivea fundamental bound for the maximum obtainable sensitivity for a given level of added detection noise. Wethen present an interaction-based readout utilising the commonly used one-axis twisting scheme that approachesthis bound for states generated via several commonly considered methods of generating quantum enhancement,such as one-axis twisting, two-axis counter-twisting, twist-and-turn squeezing, quantum non-demolition measurements,and adiabatically scanning through a quantum phase transition. We demonstrate that this methodperforms signi cantly better than other recently proposed interaction-based readouts. These results may helpprovide improved sensitivity for quantum sensing devices in the presence of unavoidable detection noise.