# Ghost imaging with engineered quantum states by Hong-Ou-Mandel interference

## TL;DR

This paper demonstrates ghost imaging using engineered quantum states with symmetric and anti-symmetric two-photon states, revealing object-image rotations and enabling dynamic control of imaging properties through spatial light modulators.

## Contribution

It introduces a method to engineer two-photon state symmetry via Hong-Ou-Mandel interference for ghost imaging, enabling new control over imaging configurations.

## Key findings

- Object-image rotations depend on the quantum state symmetry.
- Spatial light modulators allow dynamic control of the imaging process.
- Engineered quantum states enable novel ghost imaging configurations.

## Abstract

Traditional ghost imaging experiments exploit position correlations between correlated states of light. These correlations occur directly in spontaneous parametric down-conversion (SPDC), and in such a scenario, the two-photon state used for ghost imaging is symmetric. Here we perform ghost imaging using an anti-symmetric state, engineering the two-photon state symmetry by means of Hong-Ou-Mandel interference. We use both symmetric and anti-symmetric states and show that the ghost imaging setup configuration results in object-image rotations depending on the state selected. Further, the object and imaging arms employ spatial light modulators for the all-digital control of the projections, being able to dynamically change the measuring technique and the spatial properties of the states under study. Finally, we provide a detailed theory that explains the reported observations.