Ghost imaging schemes: fast and broadband.

Area of Science:

• Quantum optics
• Image reconstruction
• Wave phenomena

Background:

• Ghost imaging extracts object information by correlating a measured beam with a reference beam.
• Current ghost imaging techniques can be limited in their ability to capture high-frequency details.

Purpose of the Study:

• To introduce a spatial averaging technique to enhance the imaging bandwidth in ghost imaging.
• To investigate methods for faster correlation convergence and improved object image reconstruction.
• To explore non-local spatial filtering of reconstructed images.

Main Methods:

• Implementing a spatial averaging technique within ghost imaging schemes.
• Analyzing correlation convergence in the many-photon regime with parallel averaging.
• Comparing pixel-like and bucket detectors for object arm measurements.
• Demonstrating non-local spatial filtering on reconstructed images.

Main Results:

• The spatial averaging technique significantly improves imaging bandwidth, allowing observation of high-frequency Fourier components.
• Parallel averaging in the many-photon regime accelerates correlation convergence.
• Differences between pixel-like and bucket detectors in object reconstruction are discussed.
• Non-local spatial filtering of reconstructed images is successfully demonstrated.

Conclusions:

• The presented spatial averaging method offers a substantial improvement for ghost imaging bandwidth.
• The technique facilitates faster convergence and enhanced detail retrieval in reconstructed images.
• The findings are applicable to both entangled and classically correlated beams.