# Spatial and Temporal Resolution in Entangled Ghost Imaging

## TL;DR

This paper investigates how the temporal resolution of detectors affects the spatial resolution in entangled ghost imaging, showing that shorter integration times improve resolution by maintaining coherence among spectral components.

## Contribution

It demonstrates the impact of detector integration time on spatial resolution in ghost imaging and clarifies the conditions under which resolution can be enhanced.

## Key findings

- Longer integration times limit resolution due to angular spread effects.
- Shorter integration times preserve coherence, leading to better resolution.
- The study links temporal resolution to the spectral and spatial properties of entangled photons.

## Abstract

We show that, when the integration time of the single photon detectors is longer than the correlation time of the biphoton, the attainable spatial resolution in ghost imaging with entangled signal idler pairs generated in type II spontaneous parametric down conversion is limited by the angular spread of single-frequency-signal idler pairs. If, however, the detector integration time is shorter than the biphoton correlation time, the transverse k-vectors of different spectral components combine coherently in the image, improving the spatial resolution.

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Source: https://tomesphere.com/paper/1905.09236