Tootfinder

How the Chinese hacking community Honkers, consisting of patriotic self-taught tech enthusiasts, became an integral part of China's cyberespionage apparatus (Kim Zetter/Wired)
https://www.wired.com/story/china-honkers-elite-cyber-spies/

How China’s Patriotic ‘Honkers’ Became the Nation’s Elite Cyber Spies
A new report traces the history of the early wave of Chinese hackers who became the backbone of the state's espionage apparatus.

Trump governs today in the wake of the near-complete dismantling of checks and balances on the executive branch -- at least in the foreign policy and national security realm.
Since the 9/11 attacks, Congress has granted the presidency more and more power over foreign affairs
and declined to take any of it back,
and the Supreme Court has been reluctant to provide any meaningful restraints.
Trump inherited an ever-expanding national security apparatus that operates wi…

Imperial President at Home, Emperor Abroad
American foreign policy in an age of unrestrained executive power.

Lawmakers call on DNI to review intel sharing with Spain over Huawei revelations https://therecord.media/lawmakers-call-on-dni-to-review-spain-intel-huawei

Apparatus for the measurement of birefringence maps of optical materials: the case of crystalline silicon for Einstein Telescope
Alina Mariana Soflau, Federico Della Valle, Francesco Cescato, Giovanni Di Domenico, Aur\'elie Mailliet, Lorenzo Malagutti, Emilio Mariotti, Andrea Mazzolari, Marco Romagnoni, Guido Zavattini
https://

Apparatus for the measurement of birefringence maps of optical materials: the case of crystalline silicon for Einstein Telescope
Einstein Telescope (ET) is expected to achieve sensitivity improvements exceeding an order of magnitude compared to current gravitational-wave detectors. The rigorous characterization in optical birefringence of materials and coatings has become a critical task for next-generation detectors, especially since this birefringence is generally spatially non-uniform. A highly sensitive optical polarimeter has been developed at the Department of Physics and Earth Sciences of the University of Ferrara…

Search for post-inflationary QCD axions with a quantum-limited tunable microwave receiver
Giosu\`e Sardo Infirri, David Alesini, Caterina Braggio, Giulio Cappelli, Giovanni Carugno, Domenico D'Agostino, Alessandro D'Elia, Daniele Di Gioacchino, Raffaele Di Vora, Martina Esposito, Paolo Falferi, Umberto Gambardella, Antonios Gardikiotis, Claudio Gatti, Carlo Ligi, Giordano Lilli, Augusto Lombardi, Giovanni Maccarrone, Dora Maiello, Antonello Ortolan, Arpit Ranadive, Alessio Rett…

Search for post-inflationary QCD axions with a quantum-limited tunable microwave receiver
A search for cosmological axions has been performed by scanning a frequency region of $38\,$MHz centered at about $10.2\,$GHz, corresponding to an axion mass $m_a \simeq 42\,μ$eV. The QUAX experimental apparatus, a haloscope comprised of a 1-liter volume tunable cavity immersed in an $8\,$T magnetic field and a quantum-limited detection chain, set limits on the axion-photon coupling at the $10^{-14}\,$GeV$^{-1}$ level. As no signal candidate has been observed, viable hadronic axion models are …

Detecting the axion field with waveguide apparatus
Andr\'e H. Gomes, Winder A. Moura-Melo
https://arxiv.org/abs/2505.24617 https://

Detecting the axion field with waveguide apparatus
We demonstrate that a conventional hollow conductor waveguide filled with a material exhibiting the coexistence of chiral magnetic and anomalous quantum Hall effects supports the propagation of transverse electromagnetic modes within its interior. This simple setup provides an optically feasible and direct method to probe the simultaneous presence of these phenomena, potentially enabling the detection of the axion field in the condensed matter realm.

Exploiting complex 3D-printed surface structures for portable quantum technologies
Nathan Cooper, David Johnson, Benjamin Hopton, Matthew Overton, David Stupple, Alexandra Bratu, Edward Wilson, John Robinson, Laurence Coles, Manolis Papastavrou, Lucia Hackermueller
https://arxiv.org/abs/2507.01476

Exploiting complex 3D-printed surface structures for portable quantum technologies
Portable quantum technologies require robust, lightweight apparatus with superior performance. For techniques dependent upon high-vacuum environments, such as atom interferometers and atomic clocks, 3D-printing enables new avenues to tailor in-vacuum gas propagation dynamics. We demonstrate intricate, fine-scale surface patterning of 3D-printed vacuum components to increase the rate at which gas particles collide with the surface. By applying a non-evaporable getter coating for use as a surface…

Introduction to the theory of generalized locally Toeplitz sequences and its applications
Carlo Garoni
https://arxiv.org/abs/2506.02151 https://

Introduction to the theory of generalized locally Toeplitz sequences and its applications
The theory of generalized locally Toeplitz (GLT) sequences was conceived as an apparatus for computing the spectral distribution of matrices arising from the numerical discretization of differential equations (DEs). The purpose of this review is to introduce the reader to the theory of GLT sequences and to present some of its applications to the computation of the spectral distribution of DE discretization matrices. We mainly focus on the applications, whereas the theory is presented in a self-…

This https://arxiv.org/abs/2504.17108 has been replaced.
initial toot: https://mastoxiv.page/@arXi…

Computational Physics in the Advanced Lab: Experiment and Simulation of Thermal Diffusion in Metal Rods
We present a simple experiment on thermal diffusion in metal rods that can be used to integrate computation into the advanced lab. An analytical solution exists for the transient heat conduction in an infinite rod with a delta function heat input, but no analytical solution exists for short rods or for long duration heat inputs. Our apparatus is a copper rod with a heater and thermometers attached to the rod. The temperature of the metal rod due to transient heat conduction can be modeled using…

This https://arxiv.org/abs/2310.04310 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_qu…

Spreading of information on a network: a quantum view
This paper concerns the modeling of the spread of information through a complex, multi-layered network, where the information is transferred from an initial transmitter to a final receiver. The mathematical model is deduced within the framework of operatorial methods, according to the formal mathematical apparatus typical of quantum mechanics. Two different approaches are considered: one based on the ($H,ρ$)-induced dynamics and one on the Gorini--Kossakowski--Sudarshan--Lindblad (GKSL) equati…

Probing the Physical Reality of Projective Measurements
Leonard Werner Pingen, Mattia Moroder, Sebastian Paeckel
https://arxiv.org/abs/2506.20618 https://

Probing the Physical Reality of Projective Measurements
We propose a protocol to test whether the postulate of a measurement acting as an instantaneous projection onto an eigenstate of the measurement apparatus is compatible with physical reality. This approach is solely based on repeated measurements of local quantities with frequencies that are within reach of analog quantum simulation platforms, for instance Rydberg atom arrays or ultracold gases in optical lattices. Crucially, we also develop a continuous description of a quantum measurement fin…

Measuring optical force with a torsion pendulum: a platform for independent student experimentation
Leland Russell (Dept. of Physics, Reed College, Portland OR USA), Ezekiel A. Rein (Dept. of Physics, Reed College, Portland OR USA), Anatalya Piatigorsky (Dept. of Physics, Reed College, Portland OR USA), Jennifer T. Heath (Dept. of Physics, Reed College, Portland OR USA)

Measuring optical force with a torsion pendulum: a platform for independent student experimentation
In this work, the force due to radiation pressure is measured with sub-10 pN sensitivity, corresponding to less than 2 mW of optical power. The apparatus adds homemade reflectors to a commercial Cavendish balance, which consists of a torsion pendulum with a built-in capacitance position sensor. When driven by four 5 mW laser diodes, with square-wave modulation at the pendulum's natural frequency, the response is strong enough to easily discern in a short time series. The discrete Fourier transf…

AC magnetic measurements with a self-oscillating LC circuit and its application to university education
Harshit Agarwal, Oleksandra Uralska, Jasmin Billingsley, Maxim Yamilov, Hyunsoo Kim
https://arxiv.org/abs/2506.16709

AC magnetic measurements with a self-oscillating LC circuit and its application to university education
Understanding the magnetic properties of matter plays a key role in materials physics. However, university education on fundamental magnetism is limited to a theoretical survey because of the lack of appropriate apparatus that can be applied for laboratory courses at the undergraduate level. In this work, we introduce an AC magnetometer based on the Colpitts self-oscillator with an inductor coil as a probe. We show that this type of self-oscillator can be adopted in a typical university laborat…