Quantum computers do not compute at speeds faster than the speed of light. The speed of light in a vacuum, denoted by 'c', is a fundamental constant in physics and sets an upper limit on how fast information can travel. According to the principles of relativity, no information or signal can propagate faster than the speed of light.
Quantum computers, like classical computers, are bound by the laws of physics and are subject to this limit. The speed at which quantum computations are performed is not determined by the speed of light but by the physical processes involved in manipulating and measuring quantum states.
However, it's worth noting that quantum computers can potentially solve certain problems more efficiently than classical computers due to their ability to perform parallel computations and exploit quantum phenomena. This efficiency gain is related to the unique computational properties of quantum systems, such as superposition and entanglement, rather than a violation of the speed of light limit.