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Information geometry of emergent symmetry quotients and their weak unfoldings
Arnaud Coatanhay, Arnaud Coatanay, Angélique Drémeau
A regular observed statistical model may converge to a limit in which a previously identifiable signed parameter becomes identifiable only modulo a reflection. We study the local i…
Geometry and observability of latent texture-coherence diffusions in coherent sea-clutter radar observations
Arnaud Coatanhay, Angélique Drémeau
A coherent radar observes sea clutter through a non-injective multiplicative combination of latent texture and coherence variables. We study a class of partially observed slow--fas…
A Wigner-based volumetric transport framework for paraxial waves in random media
Arnaud Coatanhay, Thomas Bonnafont, Angélique Dremeau
We develop a Wigner-based phase-space framework for mean paraxial wave propagation in random media. Starting from the random parabolic wave equation, we derive the exact evolution…
Stellar Braid Monodromy of Finite-Rank Non-Gaussian Photonic States
Arnaud Coatanhay, Angelique Dremeau
Finite-rank non-Gaussian bosonic states admit a holomorphic description in the Bargmann representation: after a zero-free Gaussian factor is separated off, their non-Gaussian struc…
CV-QKD over Turbulence Channels with Virtual Photon Subtraction and Quantum Multiple-Symbol Detection for Underwater Quantum Communications
Nour Rizk, Hesham S. Ibrahim, Angélique Drémeau +1
Continuous-variable quantum key distribution (CV-QKD) is a promising approach for secure underwater quantum communications (UQCs), where propagation loss, scattering, turbulence, a…
Non-Maximally Entangled States for Quantum Key Distribution in Underwater Channels: BBM92 Protocol via Kraus Operators
Nour Rizk, Angélique Drémeau, Arnaud Coatanhay
Underwater optical channels pose significant challenges to the security and reliability of quantum communication systems due to absorption and scattering. In this paper, we investi…
Performance Analysis of Underwater Quantum Key Distribution Protocols: BB84, SARG04, and BBM92
Nour Rizk, Angélique Drémeau, Arnaud Coatanhay
This study compares the quantum bit error rate (QBER) performance of BB84, SARG04, and the entanglement-based BBM92 protocol in non-turbulent underwater optical channels. Clear, co…
From State-Space Transport to Measurement-Aware Distinguishability in Quantum Sensing
Arnaud Coatanhay, Angélique Drémeau
Overlap-based distinguishability measures, such as fidelity- or Chernoff-type quantities, play a central role in quantum sensing and quantum illumination. In strongly lossy and flu…