High Resolution Hyperspectral Quantum Infrared Imaging with Undetected Photons
Abstract
Quantum sensing in the infrared regime often demands the use of expensive and cryogenically operated detectors. Nonlinear interferometry has paved the way for information transfer from the infrared to the near--infrared or visible regime in various quantum technologies. A particularly interesting application of these interferometers involves spectrally--resolved quantum imaging using undetected photons, enabled by the use of temperature--tunable parametric amplifiers. In this work, we demonstrate spectrally resolved transmission imaging with undetected photons around 1550 nm using a spontaneous parametric down conversion based folded nonlinear interferometric scheme, registering the attenuation of a zebrafish larva as a biological feasibility test. We characterize and calibrate the interferometer, having achieved spectrally resolved interference fringes with a maximum baseline visibility of ∼ 74% in the near--infrared regime. Phase--stepped readout of a grating spectrometer gives a resolving power of ∼1460 (from the spectrometer's point spread function) at 1550 nm, and ∼ 730 from the coherence length, the finest reported for imaging with undetected photons, over an instantaneous spectral window of ≈ 51 cm−1.
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BibTeX
@misc{bharatia2026high,
title = {{High Resolution Hyperspectral Quantum Infrared Imaging with Undetected Photons}},
author = {Aadi Suketu Bharatia and Vidya Prakash Muppalla and Ananya Asthana and Priyanka Kandankel and Tanmoy Chakraborty and Sreelaja Nair and Anshuman Kumar},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.32292},
eprint = {2610.32292},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.32292},
}
RIS
TY - UNPB
TI - High Resolution Hyperspectral Quantum Infrared Imaging with Undetected Photons
AU - Aadi Suketu Bharatia
AU - Vidya Prakash Muppalla
AU - Ananya Asthana
AU - Priyanka Kandankel
AU - Tanmoy Chakraborty
AU - Sreelaja Nair
AU - Anshuman Kumar
PY - 2026
DA - 2026/10/23
PB - arXiv
DO - 10.48550/arxiv.2610.32292
UR - https://arxiv.org/abs/2610.32292
AB - Quantum sensing in the infrared regime often demands the use of expensive and cryogenically operated detectors. Nonlinear interferometry has paved the way for information transfer from the infrared to the near--infrared or visible regime in various quantum technologies. A particularly interesting application of these interferometers involves spectrally--resolved quantum imaging using undetected photons, enabled by the use of temperature--tunable parametric amplifiers. In this work, we demonstrate spectrally resolved transmission imaging with undetected photons around 1550 nm using a spontaneous parametric down conversion based folded nonlinear interferometric scheme, registering the attenuation of a zebrafish larva as a biological feasibility test. We characterize and calibrate the interferometer, having achieved spectrally resolved interference fringes with a maximum baseline visibility of ∼ 74% in the near--infrared regime. Phase--stepped readout of a grating spectrometer gives a resolving power of ∼1460 (from the spectrometer's point spread function) at 1550 nm, and ∼ 730 from the coherence length, the finest reported for imaging with undetected photons, over an instantaneous spectral window of ≈ 51 cm^−1.
ER -