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International Conference Laser Optics (ICLO)

Ghost polarimetry based on entangled quantum states

D. P. Agapov, I. A. Belovolov, Sergey A Magnitskiy, A. S. Chirkin

Published Nov 2, 2020• 0 citations
Publisher

Abstract

The first experimental implementation of ghost polarimetry using quantum light is presented. The object is irradiated by one of the photons of an entangled pair generated by SPDC source. Objects whose polarization properties can be interpreted as linear dichroism are used. The coincidence counting technique is used to measure the distribution of the polarization properties of the object.

DOI
10.1109/iclo48556.2020.9285843

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The first experimental implementation of ghost polarimetry using quantum light is presented. The object is irradiated by one of the photons of an entangled pair generated by SPDC source. Objects whose polarization properties can be interpreted as linear dichroism are used. The coincidence counting technique is used to measure the distribution of the polarization properties of the object.
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In this work, pairs of entangled photons are aimed at two spatially separated detectors: the path to one detector contains a physical object, while the path to the second detector does not. Yet, the second detector can be used to create an image of the object, even though none of the photons arriving at that detector have ever interacted with the object! This “ghost” imaging takes advantage of information that is shared between entangled photon pairs. This work aims to explore the underlying principles in a ghost imaging system that utilizes spontaneous parametric down-conversion (SPDC) as the source of entangled photons, with the larger goal of understanding the principles and operation of key parts of the system.
When observing a ghost image, information on an object is obtained by measuring the spatial correlation between photons propagating in the object and reconstruction channels. In the traditional schemes involving two-mode entangled quantum states or quasithermal light sources, the correlation function of photons has a background associated with the average number of photons in the channels. It has been shown in this work that the use of polarization-entangled states, e.g., Bell states, allows removing this background and, thereby, obtaining a higher quality reconstructed image.