There are numerous quantum computers, and right now, they generally only exist for the purpose of scientific research, and they are not found anywhere but a lab. The quantum computers that do exist have been employed using optics, superconducting qubits, semiconductors, NMR, and ion traps. They are not practical, but they do operate at a much different rate than the classic computer.
IBM, Google, and Microsoft are creating their own, while places such as The United States and Chinese governments are all investing in the equipment. There are a few quantum computers which are available to people. They are built by a company called D-Wave, and they cost $15 billion. It is debatable, however, whether they are “quantum driven” computers.
The correct answer to this question is No. Quantum computers do not yet exist in full. There are machines that allow the computer to do a small part of what the full computer would be able to do when created. These computers are computation devices. They are unique and involve phenomena like superpositions and entanglements.
Quantum computers allow computers to show intelligence. This process is done from learning from experiences and become as accurate as possible over time. Quantum computers can also be used for a number of things like molecular modeling, which can help analyze chemical reactions.