Tootfinder

Wikimedia Commons Picture of the Year
By Diego Delso, CC-BY-SA
https://commons.wikimedia.org/wiki/Commons:Picture_of_the_Year/2024/Results/All

On the fault diameter and wide diameter of the exchanged 3-ary $n$-cube
Rongshuan Geng, Wantao Ning
https://arxiv.org/abs/2508.07174 https://arxiv.org/pdf/…

On the fault diameter and wide diameter of the exchanged 3-ary $n$-cube
Fault diameter and wide diameter are two critical parameters for evaluating communication performance in interconnection networks. They measure the fault tolerance and transmission efficiency of networks. The exchanged 3-ary $n$-cube is a recently proposed variant of the hypercube, denoted by $E3C(r, s, t)$. In this work, we obtain that the $(2r + 1)$-fault diameter and $(2r + 2)$-wide diameter of $E3C(r, s, t)$ are bounded between $n + 3$ and $n + 5$ for $1 \leq r \leq s \leq t$.

Cat states in one- and two-mode $\mathbb{Z}_3$ Rabi models
Anatoliy I. Lotkov, Denis V. Kurlov, Valerii K. Kozin, Jelena Klinovaja, Daniel Loss
https://arxiv.org/abs/2509.08603 …

Cat states in one- and two-mode $\mathbb{Z}_3$ Rabi models
We investigate one- and two-mode variants of the $\mathbb{Z}_3$-symmetric quantum Rabi model, which describe the interaction of a qutrit with one or two bosonic modes and are directly relevant for circuit-QED and spin-qudit platforms. We find a canonical transformation that allows one to obtain the spectrum of the $\mathbb{Z}_3$ Rabi model using perturbation theory in a magnetic field. We show that in a certain parameter regime (deep-strong-coupling and a small magnetic field) the three lowest …

On the Resilience of Direction-Shift Keying Against Phase Noise and Short Channel Coherence Time at mmWave Frequencies
Mohaned Chraiti, Ozgur Ercetin, Ali Ghrayeb, Ali Gorcin
https://arxiv.org/abs/2509.01103

On the Resilience of Direction-Shift Keying Against Phase Noise and Short Channel Coherence Time at mmWave Frequencies
The rapid variation of the wireless channel (short channel coherence time) and the phase noise are two prominent concerns in Millimeter-wave (mmWave) and sub-Terahertz systems communication systems. Equalizing the channel effect and tracking the phase noise necessitate dense pilot insertion. Direction-Shift Keying (DSK), a recent variant of Spatial Modulation (SM), addresses these challenges by encoding information in the Direction-of-Arrival (DoA) using a distributed antenna system (DAS), rath…

Towards Constant Time Multi-Call Rumor Spreading on Small-Set Expanders
Emilio Cruciani, Sebastian Forster, Tijn de Vos
https://arxiv.org/abs/2508.18017 https://

Towards Constant Time Multi-Call Rumor Spreading on Small-Set Expanders
We study a multi-call variant of the classic PUSH&PULL rumor spreading process where nodes can contact $k$ of their neighbors instead of a single one during both PUSH and PULL operations. We show that rumor spreading can be made faster at the cost of an increased amount of communication between the nodes. As a motivating example, consider the process on a complete graph of $n$ nodes: while the standard PUSH&PULL protocol takes $Θ(\log n)$ rounds, we prove that our $k$-PUSH&PULL variant complet…

An Improved ChaCha Algorithm Based on Quantum Random Number
Chao Liu, Shuai Zhao, Chenhao Jia, Gengran Hu, Tingting Cui
https://arxiv.org/abs/2507.18157 https://

An Improved ChaCha Algorithm Based on Quantum Random Number
Due to the merits of high efficiency and strong security against timing and side-channel attacks, ChaCha has been widely applied in real-time communication and data streaming scenarios. However, with the rapid development of AI-assisted cryptanalysis and quantum computing technologies, there are serious challenges to the secure implementation of ChaCha cipher. To further strengthen the security of ChaCha cipher, we propose an improved variant based on quantum random numbers, i.e., Quantum Rando…

Proton trekt zich langzaam terug uit Zwitserland - Emerce
https://www.emerce.nl/nieuws/proton-trekt-zich-langzaam-terug-uit-zwitserland

Collective communication in a transparent world: Phase transitions in a many-body Potts model and social-quantum duality
Pawat Akarapipattana, Sergei Nechaev, Bogdan Slavov
https://arxiv.org/abs/2508.20267

Collective communication in a transparent world: Phase transitions in a many-body Potts model and social-quantum duality
We consider the Schelling-like social competition reflected in "dynamics of opinions" among groups of agents ("communities") in a highly transparent world. Specifically, we investigate a $q$-state Potts spin system with competing two- and three-body interactions on a complete graph. Agents interact through pairwise repulsion (opposing opinions) between different communities and three-body attraction (shared opinions) within the same community. In the thermodynamic limit, we identify variants of…

Enforcing Convergence in Sensitivity-based Distributed Programming via Transformed Primal-Dual Updates
Maximilian Pierer von Esch, Andreas V\"olz, Knut Graichen
https://arxiv.org/abs/2509.15938

Enforcing Convergence in Sensitivity-based Distributed Programming via Transformed Primal-Dual Updates
Sensitivity-based distributed programming (SBDP) is an algorithm for solving large-scale, nonlinear programs over graph-structured networks. However, its convergence depends on the coupling strength and structure between subsystems. To address this limitation, we develop an algorithmic variant: SBDP+. The proposed method utilizes first-order sensitivities and primal decomposition to formulate low-dimensional, decoupled subproblems, which are solved in parallel with neighbor-to-neighbor communic…

Path-filtration for modal logics applied to revisiting quasi-dense logics
Olivier Gasquet
https://arxiv.org/abs/2507.11258 https://ar…

Path-filtration for modal logics applied to revisiting quasi-dense logics
In https://arxiv.org/pdf/2405.10094 (also published at LICS'24 conference), Lyon and Ostropolski-Nalewaja answer the question of the decidability of quasi-dense modallogics, and give an upper bound in EXPSPACE. Unfortunately, their intricate proof contains a major flaw that cannot be fixed, leaving the question wide open. In this paper we provide a correct and rather simple and direct proof of it by introducing a new variant of the well-know filtration method based on paths in a canonical model…