arXiv subjects

O. Page

Publications and source records attributed to O. Page.

2 recordsLinked to original sources

arXiv2025

Calculating Vibronic Spectra with a linear algorithm based on Gaussian Boson Sampling

Accurately simulating molecular vibronic spectra remains computationally challenging due to the exponential scaling of required calculations. Here, we show that employing the linear coupling model within the gaussian boson sampling framework effectively addresses this limitation. We implement the algorithm for simulating the pentacene molecule through three distinct approaches, using numerical simulation on a classical computer and experimentally using two optical setups equipped with different photon detectors (SNSPD and SPAD). High fidelity $(F>0.999)$ was achieved between the simulated Franck-Condon profiles and analytically calculated profiles obtained by enumerating all possible transitions within the linear coupling model. Furthermore, simulations were performed for larger molecular systems using 48 vibrational modes of naphthalene and 64 vibrational modes of anthracene. Comparison with experimental data confirms that the simulated spectra accurately reproduce both the positions and shapes of the measured spectral bands. A notable advantage of our algorithm is its scalability, requiring only a fixed minimal set of optical components irrespective of the size of the studied system.

quant-ph↗

arXiv2021

Implementation of the CRPA model in the GENIE event generator and analysis of nuclear effects in low-energy transfer neutrino-nucleus interactions

We present the implementation and validation of the Hartree-Fock continuum random phase approximation (HF-CRPA) model in the GENIE neutrino-nucleus interaction event generator and a comparison of the subsequent predictions to experimental measurements of lepton kinematics from interactions with no mesons in the final state. These predictions are also compared to those of other models available in GENIE. It is shown that, with respect to these models, HF-CRPA predicts a significantly different evolution of the cross section when moving between different interaction targets, when considering incoming anti-neutrinos compared to neutrinos and when changing neutrino energies. These differences are most apparent for interactions with low energy and momentum transfer. It is also clear that the impact of nucleon correlations within the HF-CRPA framework is very different than in GENIE's standard implementation of RPA corrections. Since many neutrino oscillation experiments rely on their input model to extrapolate between targets, flavours, and neutrino energies, the newly implemented HF-CRPA model provides a useful means to verify that such differences between models are appropriately covered in oscillation analysis systematic error budgets.

hep-ex↗