Super-resolved coherent Raman spectroscopy with quantum light

In recent years, entangled photons—a popular quantum light source—have been widely used in quantum imaging, optical interferometry, quantum computing, quantum communication, and other fields. Spontaneous parametric down-conversion generates the entangled photon pairs with conserved energy and momentum, so that the quantum correlation in space and time is encoded. Such a property enables a quantum advantage that overcomes the diffraction limit of classical pulses in the field of imaging and detection.