What Kind of Technologies are Needed to Build an Interstellar Battleship?

It was Prototype No.1. Alice had used six months and her computing power of 10 sextillion Tflops to finally design a prototype of the interstellar battleship. Its appearance resembled a broad sword; wide at the back and tapering to a slim front. It looked very sharp. Its various parameters were: Length: 412 meters. Widest width: 71 meters. Height: 32 meters. Weight: 382,000 tons. Energy system: a small nuclear fusion reactor. Power system: Ion engine.

As for the weapon configuration, by the hatch of the ship was a large caliber particle cannon. Many laser cannons were distributed at the sides of the ship, while the upper portion was equipped with electromagnetic cannons for close-range defense. Missiles and nuclear torpedo launchers of great power were installed on the bottom of the ship. In addition, there was an advanced radar system, a sighting system, and an intelligent remote control system.