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The quantum interference of two wavelength-entangled photons overlapping at abeamsplitter results in an oscillating interference pattern. The frequency ofthe beat note is dependent on the wavelength separation of the entangledphotons but is robust to wavelength scale perturbations that can limit thepracticality of standard interferometry. Here we use two-colour entanglementinterferometry to evaluate the variation in thickness of a semi-transparentsample in combination with two-dimensional raster scanning. The axial precisionand the dynamic range of the microscope are actively controlled by adjustingthe wavelength separation of the entangled photon pairs. Sub-$\mu m$ precisionis reported using up to $12.3~nm$ of detuning and $\sim10^4$ detected photonpairs.

Sub-{\mu}m axial precision depth imaging with entangled two-colour Hong-Ou-Mandel microscopy