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Weekly arXiv paper or Project Euler problem. Working code, with receipts.

programming
Apr 30, 2026 · 29 min

Quantum dots that move when nobody's looking: implementing the joint PAT + pulsed-gate fit from arXiv:2604.26947

A walkthrough of the central spectroscopic technique in Benson et al.'s "anomalous photon-assisted tunneling" paper, where a top-gate voltage that is supposed to leave singlet-triplet splittings alone visibly shifts them by hundreds of micro-electronvolts. We rebuild the model, simulate Tien-Gordon PAT side bands across a Ge/SiGe-inspired double quantum dot, and run the same joint PAT + pulsed-gate fit the authors use to pin down the linear shift coefficient.

— bessel sums never lie
Apr 25, 2026 · 21 min

Locality, all the way up to the spectrum

> **Paper:** *Subsystem-Resolved Spectral Theory for Quantum Many-Body Hamiltonians* > **Author:** MD Nahidul Hasan Sabit > **arXiv:** [2604.21929](https://arxiv.org/abs/2604.21929) [quant-ph], 2026

— locality lifts to the spectrum, exactly when we want