All-optical deconvolution via quantum cross-correlation spectroscopy with bright twin beams

@misc{eto2026alloptical,
  title = {{All-optical deconvolution via quantum cross-correlation spectroscopy with bright twin beams}},
  author = {Yujiro Eto},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2610.13074},
  eprint = {2610.13074},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2610.13074},
}

TY  - UNPB
TI  - All-optical deconvolution via quantum cross-correlation spectroscopy with bright twin beams
AU  - Yujiro Eto
PY  - 2026
DA  - 2026/10/09
PB  - arXiv
DO  - 10.48550/arxiv.2610.13074
UR  - https://arxiv.org/abs/2610.13074
AB  - The resolution of spectroscopic measurements is fundamentally limited by the convolution between a system's intrinsic response and the instrument response function, creating an ill-posed inverse problem. While entangled photons can theoretically bypass these limits, low photon flux has hindered their experimental realization. Here, we propose quantum cross-correlation spectroscopy (QCCS), utilizing macroscopic twin beams (signal and idler beams) to physically circumvent this convolution limit in coherent anti-Stokes Raman scattering. Employing the signal beam as a broadband probe, QCCS achieves all-optical deconvolution through a correlation-enhanced sum-frequency generation channel between the convoluted anti-Stokes and idler beams. By subtracting the uncorrelated background using a 500-femtosecond temporal window, we successfully retrieve narrow Raman bands (8 cm^{-1} and 15 cm^{-1}) completely obscured by a 75 cm^{-1} probe bandwidth without numerical deconvolution or prior knowledge. Our results establish macroscopic quantum correlations as a robust resource for high-fidelity spectroscopy, paving the way for ultrashort-pulse-free operando studies under natural, incoherent excitation conditions.
ER  -