what's the potential wildest/craziest application of quantum computing

A Reddit thread explored speculative, no-limits applications of quantum computing, assuming perfect qubit stability and error-free operation. Non-technical users and experts alike debated extreme use cases beyond current hardware constraints. Top suggestions included simulating entire universes at quantum scales, enabling real-time cosmological experiments. Users proposed modeling black hole dynamics or testing multiverse theories by leveraging quantum parallelism for exponential computational power. Another radical idea was instant, unhackable global quantum networks for telepathy-like communication. Participants theorized entanglement-based systems could transmit complex thoughts or emotions directly between human brains via quantum-linked neural interfaces. Some envisioned quantum AI achieving superintelligence by processing all possible decision paths simultaneously. This could lead to machines solving existential risks like climate change or disease by brute-forcing optimal solutions across infinite variables. Less discussed but notable was quantum time manipulation—using closed timelike curves in algorithms to "reverse-engineer" past events. While purely theoretical, it highlighted the field’s intersection with fundamental physics and science fiction.