Fulfilling entanglement's optimal advantage via converting correlation to coherence

Entanglement boosts performance limits in sensing and communication, and surprisingly even more in presence of entanglement-breaking noise. However, to maximally fulfill such advantages requires an optimal measurement design, a challenging task as information is encoded in the feeble quantum correlation after entanglement's death. For this reason, there is a long list of protocols with optimal receivers still elusive long after their debut. We propose a conversion module to capture and transform such quantum correlation to coherent quadrature displacement, which enables the optimal receiver design for a wide range of entanglement-enhanced protocols, including target detection (quantum illumination), phase estimation, classical communication, target ranging and arbitrary thermal-loss channel pattern classification. Our module is completely off-the-shelf and provides a paradigm of processing noisy quantum correlations for near-term implementation.