v1.9.0

1.9.0 (2026-03-24)

Bug Fixes

• Add missing List import to NestedIterator (ee17ab0)
• Correct formatting of quantum state representation and clarify description of Polarizing Beam Splitter in quantum_information.md (f6ef330)
• Correct the representation of the total state in terms of Bell states in quantum_information.md for accurate mathematical formulation. (f64b869)
• Refactor quantum state representation in quantum_information.md for clarity and consistency in notation. (e17f6c6)
• Standardize LaTeX notation for messages, keys, and ciphertext in quantum_information.md for improved clarity and consistency. (5fbcb18)
• Standardize tab syntax in AGENTS.md and CLAUDE.md for consistency (5804e56)
• Update AGENTS.md (3493d6d)
• Update CLAUDE.md (9867bf7)

Features

• Add AGENTS.md and CLAUDE.md files to provide guidance for AI Agents and Claude Code, respectively. Include project overview, commands, content architecture, key configuration, tabbed content syntax, math rendering, and branch strategy. (7b7fcc7)
• Add Design Twitter problem and implementation (ced6415)
• Add documentation for Range Sum Query - Mutable problem and implementation (28bf7db)
• Add Entanglement Swapping section to quantum_information.md, detailing the protocol, initial setup, measurement process, and implications for quantum communication. Enhance understanding of entanglement creation between non-interacting particles and clarify common misconceptions. (b1be8f1)
• Add Flatten Nested List Iterator problem and implementation (fa65b95)
• Enhance quantum_information.md with detailed sections on beam splitters, superposition, and interference concepts, including examples and mathematical formulations. Add Quantum Key Distribution (QKD): BB84 section placeholder. (0f45531)
• Expand quantum_information.md with comprehensive sections on polarization, including qubit representation, wave plates, and measurement effects. Introduce key concepts and mathematical formulations related to polarization states. (3f99e01)
• Introduce Dense Coding section in quantum_information.md, detailing the protocol, Bell states, encoding and decoding processes, and practical implementations. Enhance understanding of quantum communication capacity and common misconceptions. (d3fa815)
• Revise Quantum Key Distribution section in quantum_information.md to provide a comprehensive overview, including the BB84 protocol, its principles, and the B92 protocol. Enhance clarity on security mechanisms and common misconceptions. (b179e40)
• Update Makefile for mdbook toolchain installation and enhance quantum_information.md with a comprehensive overview of quantum teleportation, including key concepts, the no-cloning theorem, and the measurement process. (7f67d7b)