# Advanced Topics

- [Introduction to PoEM](/advanced-topics/introduction-to-poem.md): Qui AI’s Proof-of-Entropy-Minima consensus mechanism.
- [Interoperability](/advanced-topics/interoperability.md): Specifications of Qui AI’s interoperability between shards.
- [Merged Mining](/advanced-topics/merged-mining.md): How merged mining has been adapted and used to scale in Qui AI.
- [Multithreaded Execution](/advanced-topics/multithreaded-execution.md): How Qui AI processes transactions in parallel.
- [Hierarchical Structure](/advanced-topics/hierarchical-structure.md): Detailed specification of Qui AI’s hierarchical structure.
- [Sharding](/advanced-topics/sharding.md): How sharding is implemented and used to scale in Qui AI.
- [Latency](/advanced-topics/latency.md): How Qui AI optimizes geographical latency in order to scale.