We took only ~10,000 years from stone age to quantum computer. The Homo sapiens sapiens was appeared 200,000 years ago. Maybe we could have had a world war that killed almost everyone up to 20 times. So I think it is possible that long, long time ago we entered the digital age and built a quantum computer. But a war wiped out almost everything.
Is it possible that we built a quantum computer 50,000 years ago?
If it is possible for a species like humans to develop faster or that ancient humans had developed such technology in our timeline with the archaeological evidence we have?
For example, The ancient Chinese (Terracotta Army) has a chrome plating on their weapon. Chromate oxidization is an advanced technique and there are only two ways to achieve it. Chemical chrome plating and chromium electroplating. The latter was developed in the twentieth century; Germany and the U.S. both claimed patent rights for the process in 1937 and 1950, respectively.