Time-to-space ghost imaging

TL;DR

This paper proposes a novel approach to temporal ghost imaging by utilizing spatial ghost imaging techniques with entangled photons, achieving sub-picosecond temporal resolution beyond previous limits.

Contribution

It introduces a method to improve temporal resolution in ghost imaging using spatial correlations of entangled photon pairs, surpassing existing photodetector limitations.

Findings

Achieves sub-picosecond temporal resolution.

Utilizes entangled photon sources for enhanced imaging.

Proposes a feasible experimental setup.

Abstract

Temporal ghost imaging is based on the temporal correlations of two optical beams and aims at forming a temporal image of a temporal object with a resolution, fundamentally limited by the photodetector resolution time and reaching 55 ps in a recent experiment. For further improvement of the temporal resolution, it is suggested to form a spatial ghost image of a temporal object relying on strong temporal-spatial correlations of two optical beams. Such correlations are known to exist between two entangled beams generated in type-I parametric downconversion. It is shown that a sub-picosecond-scale temporal resolution is accessible with a realistic source of entangled photons.