You can read Feynman's original paper about quantum computers, which is easy to read and makes clear why programmability is important https://catonmat.net/ftp/s

You can read Feynman's original paper about quantum computers, which is easy to read and makes clear why programmability is important https://catonmat.net/ftp/simulating-physics-with-computers-richard-feynman.pdf https://catonmat.net/ftp/simulating-physics-with-computers-r...