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Considering non-Hermitian systems implemented by utilizing enlarged quantumsystems, we determine the fundamental limits for the sensitivity ofnon-Hermitian sensors from the perspective of quantum information. We provethat non-Hermitian sensors do not outperform their Hermitian counterparts(directly couples to the parameter) in the performance of sensitivity, due tothe invariance of the quantum information about the parameter. By scrutinizingtwo concrete non-Hermitian sensing proposals, which are implemented using fullquantum systems, we demonstrate that the sensitivity of these sensors is inagreement with our predictions. Our theory offers a comprehensive andmodel-independent framework for understanding the fundamental limits ofnon-Hermitian quantum sensors and builds the bridge over the gap betweennon-Hermitian physics and quantum metrology.

Fundamental Sensitivity Limits for non-Hermitian Quantum Sensors