No, quantum computers themselves do not imply a many-worlds interpretation (MWI) of quantum mechanics. The many-worlds interpretation is just one of several interpretations that attempt to explain the behavior of quantum systems.
Quantum computers are devices that utilize the principles of quantum mechanics to perform certain types of computations more efficiently than classical computers. They exploit the phenomena of superposition and entanglement, which are fundamental aspects of quantum mechanics.
The many-worlds interpretation, on the other hand, is a theoretical framework that suggests that the wavefunction, which describes the state of a quantum system, does not collapse when an observation or measurement is made. Instead, it argues that the universe branches into multiple "worlds" or "branches," each representing a different possible outcome of the measurement. These branches are not directly observable and exist in a separate realm.
While quantum computers make use of quantum mechanical principles, they do not inherently require or imply the truth of any specific interpretation, including the many-worlds interpretation. The interpretation of quantum mechanics remains an open and ongoing topic of debate among physicists, and various interpretations exist alongside the development of quantum computing.