Welcome to the Quantum News Daily Brief. Story 1: Lean-Quantum: Toward AI-Assisted Formalization of Quantum Information. A team led by Kazumi Kasaura has developed Lean-Quantum, a Lean 4 library that formalizes quantum information theory, enabling machine-checkable proofs. The library establishes a basis-independent framework for finite-dimensional quantum mechanics, compatible with Mathlib, and includes interfaces for states, channels, tensor products, and key representations like Choi and Krau