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Photonic Quantum Computing Quantum Simulation

Hyperspectral imaging of downconverted photons in angle phase-matched nonlinear crystals.

PubMed
Authors: Kumar EJ, Uboldi L, Manzoni C, Cerullo G, Srimath Kandada AR

Year

2026

Paper ID

9937

Status

Peer-reviewed

Abstract Read

~2 min

Abstract Words

93

Citations

1

Abstract

Spontaneous Parametric Downconversion (SPDC) is key to generating broadband spectrally entangled photons for quantum optical spectroscopy. Here, we use a common-path birefringent interferometer to experimentally map the spatial-spectral distribution of SPDC in Type I and II -barium borate crystals using hyperspectral k-space imaging. Under broadband pulsed pumping, we observe strong spatial variations in the spectra, with distinct features for each phase-matching type. Simulations based on biphoton amplitudes and phase-matching conditions qualitatively match our results. This spatial-spectral mapping enables control over biphoton entanglement entropy, paving the way for optimized quantum-light sources for material spectroscopy.

Why This Paper Matters

  • This paper contributes to the Quantum Simulation research area in the Quantum Articles archive.
  • It adds a 2026 reference point for readers tracking recent quantum research.
  • Spontaneous Parametric Downconversion (SPDC) is key to generating broadband spectrally entangled photons for quantum optical spectroscopy.

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References & Citation Signals

[1] DOI https://doi.org/10.1364/OL.587889 [2] Publisher https://pubmed.ncbi.nlm.nih.gov/41686931/

Local Citation Graph (Related-Paper Links)

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External citation index: OpenAlex citation signal • updated 2026-10-27 18:27:05

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