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Extracting useful signals is key to both classical and quantum technologies.Conventional noise filtering methods rely on different patterns of signal andnoise in frequency or time domains, thus limiting their scope of application,especially in quantum sensing. Here, we propose a signal-nature-based (notsignal-pattern-based) approach which singles out a quantum signal from itsclassical noise background by employing the intrinsic quantum nature of thesystem. We design a novel protocol to extract the Quantum Correlation signaland use it to single out the signal of a remote nuclear spin from itsoverwhelming classical noise backgrounds, which is impossible to beaccomplished by conventional filter methods. Our work demonstrates thequantum/classical nature as a new degree of freedom in quantum sensing. Thefurther generalization of this quantum nature-based method opens a newdirection in quantum research.

Detection of quantum signals free of classical noise via quantum correlation