Self-calibrating optical low-coherence reflectometry with energy-time entangled photons for absolute distance measurements

Unternährer, Manuel; Stefanov, André (2020). Self-calibrating optical low-coherence reflectometry with energy-time entangled photons for absolute distance measurements. Quantum science and technology, 5(4), 045009. IOP Publishing 10.1088/2058-9565/aba887

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Optical low-coherence reflectometry is capable of unambiguously measuring positions of stacked, partially reflective layers in a sample object. It relies on the low coherence of the light source and the absolute distances are obtained from the position reading of a mechanical motor stage. We show how to exploit the simultaneous high and low coherence properties of energy-time entangled photon pairs to directly calibrates the position scale of an OLCR scan with a reference laser wavelength. In experiment, a precision of 1.6\,nm and good linearity is demonstrated.

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