Off-axis holographic imaging with undetected light

Quantum Imaging with Undetected Light (QIUL) leverages the quantum correlations of photon pairs, generated via spontaneous parametric down-conversion (SPDC), to extract both the amplitude and phase information of an object [1]. This process facilitates the simultaneous illumination and detection across a diverse spectral range, harnessing advanced detection technology within the visible spectrum while probing the object at an unconventional wavelength. In this study, we provide an experimental scheme of a QIUL that merges Fourier off-axis holography with a hybrid-type induced-coherence nonlinear interferometer [2,3], combining a March-Zender and Michelson interferometer to be able to angle-tune the object and reference beams in a wider range of values, and therefore accessing to the full capabilities offered by the Fourier space [4,5]. Our methodology in a wide-field configuration requires only a single-shot to reconstruct the amplitude and phase data of an object, thus introducing a strong alternative to sequential multi-frame acquisition techniques such as digital phase-shifting holography [6]. Figure 1 shows the image reconstruction process to extract the amplitude and phase information out of the single-photon hologram, a Fast Fourier Transform (FFT) of the hologram reveals the diffraction term containing the object information to be cropped and inverse Fourier transformed to extract a complex image from which the amplitude and phase are retrieved.