Quantum Compression is the process of compressing items a little too much. This is done using a Quantum Compressor.
The Quantum Compressor is a powered machine that can hold and compress extremely large amounts of materials. Items placed inside the Quantum Compressor go into an internal buffer for use in compression. The buffer is represented as a blue bar.
Each recipe usually requires a catalyst. The catalyst is placed in the left-most slot and does not get used up.
Once there are enough items in the buffer, the machine will begin to craft the item. The Quantum Compressor will only use power while crafting.
If you happen to put items into the compressor that you would rather not lose forever, you can press the eject button above the input slot to get them back.
Items in the buffer are stored in the endless void and can only be re-obtained by ejecting. Breaking the block will cause those items to get lost forever, so be careful!
The item input buffer of the Quantum Compressor is capable of holding billions of items, but by default will only hold as many as the recipe requires. You can disable this limit by clicking on the lock button next to the input buffer.