Tootfinder

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Certifying and learning quantum Ising Hamiltonians
Andreas Bluhm, Matthias C. Caro, Francisco Escudero Guti\'errez, Aadil Oufkir, Cambyse Rouz\'e
https://arxiv.org/abs/2509.10239

Certifying and learning quantum Ising Hamiltonians
In this work, we study the problems of certifying and learning quantum Ising Hamiltonians. Our main contributions are as follows: Certification of Ising Hamiltonians. We show that certifying an Ising Hamiltonian in normalized Frobenius norm via access to its time-evolution operator requires only $\widetilde O(1/\varepsilon)$ time evolution. This matches the Heisenberg-scaling lower bound of $Ω(1/\varepsilon)$ up to logarithmic factors. To our knowledge, this is the first nearly-optimal algor…

Notes on false vacuum decay in quantum Ising models
Ian G. Moss
https://arxiv.org/abs/2510.12592 https://arxiv.org/pdf/2510.12592

Notes on false vacuum decay in quantum Ising models
This paper aims to gather together some of the basic ideas behind the theory of false vacuum decay in quantum Ising models, focusing on the application of spin chains as analogue systems to false vacuum decay in elementary particle theory. Elementary results on quantum Ising models are rewritten to more closely resemble the original literature on false vacuum decay. A highly speculative conjecture for the false vacuum decay rate in a two dimensional quantum Ising model is also put forward.

Icons in macOS 26: Kampf gegen das "Squircle"-Gefängnis
Apple hat die Form seiner App-Icons in macOS 26 alias Tahoe überarbeitet. Halten sich Apps nicht daran, gibt es einen optischen Eingriff. Das hilft dagegen.

eu_procurements: EU procurement contract networks (2008-2016)
A bipartite network of public EU procurement contracts, from 2008 to 2016, between issuing buyers (public institutions such as a ministry or city hall) and supplying winners (a private firm). Contracts are aggregated into annual snapshots, edges are annotated with contract value information. Nodes are annotated with location information, including country of origin.
This network has 839824 nodes and 4098711 edges.

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Apple verschärft App-Store-Regeln gegen Copycat-Apps
Mit neuen Richtlinien will Apple verhindern, dass Entwickler fremde Marken und Icons für ihre Apps missbrauchen.
https://www.heise.de/…

Trump advisers strafe Hawley over new anti-abortion group (Alex Isenstadt/Axios)
https://www.axios.com/2025/12/15/trump-advisers-hawley-anit-abortion
http://www.memeorandum.com/251215/p19#a251215p19

Localizing the Ising CFT from the ground state of the Ising model on the fuzzy sphere
Kay Joerg Wiese
https://arxiv.org/abs/2510.09482 https://arxiv.org/pd…

Localizing the Ising CFT from the ground state of the Ising model on the fuzzy sphere
We locate the phase-transition line for the Ising model on the fuzzy sphere from a finite-size scaling analysis of its ground-state energy. This is similar to what was used to locate the complex CFT of the 5-state Potts model in dimension $d=2$ [PRL 133 (2024) 077101]. There it was shown that a CFT is characterized by a stationarity condition for the measured effective central charge. Our strategy is to write the ground-state energy as $E_{\rm GS}(N)/N_m = E_{0} + E_1 /N_m + E_{3/2}/N_m^{3/2}+ …