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Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)

Synthetic Off-Axis Quantum Holography with Undetected Light

Sebastian Töpfer, Sergio Tovar-Pérez, Josué R. León Torres, Daniel Derr, Enno Giese, Jorge Fuenzalida, Markus Gräfe

Published Jun 23, 2025• 0 citations
Publisher

Abstract

This work presents synthetic off-axis quantum holography with undetected light, a novel approach to obtain holographic information with a single acquisition. Holography is a vital tool for imaging [1] but is mainly limited to the visible range caused by the availability of efficient detectors. Interesting applications, like identifying molecular signatures and analyzing material properties are excluded, particularly those requiring detection in regions outside the visible spectra of light, for example the mid-infrared [2]. Quantum holography with undetected light (QHUL) was presented in 2022 [3] to give access to these harder-to-detect wavelength regions. However, it is required to do multiple acquisitions to reconstruct the amplitude and phase, preventing the usage in dynamic processes.

DOI
10.1109/cleo/europe-eqec65582.2025.11110361

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This work presents synthetic off-axis quantum holography with undetected light, a novel approach to obtain holographic information with a single acquisition. Holography is a vital tool for imaging [1] but is mainly limited to the visible range caused by the availability of efficient detectors. Interesting applications, like identifying molecular signatures and analyzing material properties are excluded, particularly those requiring detection in regions outside the visible spectra of light, for example the mid-infrared [2]. Quantum holography with undetected light (QHUL) was presented in 2022 [3] to give access to these harder-to-detect wavelength regions. However, it is required to do multiple acquisitions to reconstruct the amplitude and phase, preventing the usage in dynamic processes.
Quantum imaging with undetected light (QIUL) can retrieve amplitude and phase information of an object by exploiting the quantum correlations of photon-pairs generated through spontaneous parametric down conversion (SPDC), where the illumination and detection can be carried at very distinct wavelength ranges. This fact allows to benefit from a mature detection technology in the visible spectral range, while probing the object at a more exotic wavelength. Here we experimentally implement a QIUL approach with Fourier off-axis holography in a hybrid-type induced-coherence non-linear interferometer. Our approach reconstructs the amplitude and phase information of an object with a single shot in a wide-field configuration, being an alternative in front of techniques that require multiple acquisition frames, such as phase-shifting holography.
Quantum imaging with undetected light (QIUL) leverages the quantum correlations of photon pairs generated via spontaneous parametric down-conversion (SPDC) to retrieve both amplitude and phase information of an object. This method enables illumination and detection at distinct wavelength ranges, utilizing advanced detection technology in the visible spectrum while probing the object at an exotic wavelength. Here, we experimentally demonstrate a QIUL technique incorporating Fourier off-axis holography within a hybrid-type induced-coherence nonlinear interferometer. Our approach reconstructs the amplitude and phase information of an object in a single shot using a wide-field configuration, presenting a viable alternative to multi-frame acquisition techniques such as phase-shifting holography.
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.
Synthetic optical holography (SOH) introduced holographic reconstruction into scanning optical microscopy, enabling quantitative phase imaging with sequential acquisition and point detection. Here, we extend this concept to the quantum regime by implementing SOH within quantum imaging with undetected light (QIUL). By integrating a controlled synthetic phase carrier into a scanning QIUL implementation, we retrieve amplitude and phase images of objects probed by mid-infrared (MIR) photons while detecting only their visible partners. We demonstrate the method on binary, transparent, and biological samples, showing complex-field reconstruction in a scanning quantum imaging system. This approach decouples spatial resolution from photon-pair spatial correlations and establishes a route toward diffraction-limited, label-free MIR phase imaging with visible-wavelength detection.
Holography exploits the interference of a light field reflected/transmitted from an object with a reference beam to obtain a reconstruction of the spatial shape of the object. Classical holography techniques have been very successful in diverse areas such as microscopy, manufacturing technology, and basic science. However, detection constraints for wavelengths outside the visible range restrict the applications for imaging and sensing in general. For overcoming these detection limitations, we implement phase-shifting holography with nonclassical states of light, where we exploit quantum interference between two-photon probability amplitudes in a nonlinear interferometer. We demonstrate that it allows retrieving the spatial shape (amplitude and phase) of the photons transmitted/reflected from the object and thus obtaining an image of the object despite those photons are never detected. Moreover, there is no need to use a well-characterized reference beam, since the two-photon scheme already makes use of one of the photons as reference for holography.