Using pycryptodomex for encryption and signing (PKCS1 OAEP and PSS) in Python
18 mins
This is a short summary or rather recipe collection on how to use ```pycryptodomex``` for some simple encryption and decryption procedures using RSA with the OAEP schemes from ```PKCS#1``` as well as signing and verification routines using the PSS scheme.
Towards Driving Quantum Systems with the Non-Radiating Near-Field of a Modulated Electron Beam
1 min
Presented at the DPG-Frühjahrstagung der Sektion Atome, Moleküle, Quantenoptik und Photonik (SAMOP 2023) Coherent manipulation of quantum systems generally relies on electromagnetic radiation as produced by lasers or microwave sources. In the experiment presented here we attempt a novel approach to drive quantum systems, as it was recently proposed (D. Rätzel, D. Hartley, O. Schwartz, P. Haslinger, A Quantum Klystron - Controlling Quantum Systems with Modulated Electron Beams. Phys. Rev. Research 3, 023247, 2021). This method utilizes the non-radiating near-field of a modulated electron beam to coherently drive quantum systems, leading to new possibilities for controlling quantum states. For instance, one can locally address subsystems far below the diffraction limit of electromagnetic radiation or paint potentials at atomic scales. In this proof of concept experiment, we want to couple the oscillating near-field of a spatially modulated electron beam to the unpaired spins of a solid, organic radical sample (BDPA) or the hyperfine levels of laser cooled Potassium atoms. The electron beam is generated with a cathodic ray tube from a fast analog oscilloscope.
Running JupyterLab behind an authenticating haproxy setup using basic auth
9 mins
The journey of getting a JupyterLab instance running behind a haproxy reverse proxy on Manjaro Linux and FreeBSD - with some drawbacks.
Hosting your own GIT large file storage repositories
10 mins
Short introduction into gits large file storage extension, the way it works and how to run it without an external provider to host your files
Getting started with WSGI and Python as well as uwsgi application server
20 mins
A simple summary of hat WSGI can do for one, how to use it with Python and how to run the uwsgi application server (and how to solve the deployment problem there) from the viewpoint of someone who already developed web applications in many different languages and frameworks.
Using the FY6900 with an external USB to serial bridge
6 mins
Short article about circumventing the CH340 contained in the FY6900 function generator by using its external 3.3V serial interface and an CP2102 or any microcontroller.
Detecting frequency, delay and phase relation as well as multiple targets using correlation functions
15 mins
A short story about how one can use autocorrelation and cross-correlation functions on discretized samples of radio frequency data and also noise to detect the frequency of a single signal, the delay of a reflected signal, the phase relation between two signals and how one can track multiple reflective targets in applications like LIDAR, sonar or radar using correlations - and how to get them robust against external influence.
Heterodyne, Superheterodyne, Homodyne and Lock-In Amplifier
14 mins
A mini introduction about the terms heterodyne, superheterodyne, homodyne and lock-in amplifier
Simple time lapse with ffmpeg
4 mins
Short summary on how to generate time lapse videos from webcams or other sources using ffmpeg on various platforms
Simple laser cutting and engraving capabilities for a 3D printer with a 450nm diode laser
27 mins
This article summarizes some experiments using a simple 450nm laser diode on a 3D printer for some basic laser cutting and engraving in paper, plywood and other simple to cut materials.
