As we all know our world is getting advanced day by day in technology if its mobile phone or any tech. So why we are using a classical computer if we have a quantum computer? The goal of quantum computing is to find algorithms that are considerably faster than a classical computer. The quantum computer seems to be no longer just for physicists and computer scientists, but also for information system researchers. In this paper we will study the advantages of quantum computers over the classical computers, why it is better, and also the problems that we face while operating quantum computers.