In the context of quantum physics, the term "observer" typically refers to a measurement process that collapses the quantum state of a system into a definite outcome. In this sense, any physical system that interacts with another system and causes a collapse of its wave function can be considered an observer.
Quantum computers, on the other hand, are devices designed to manipulate and process quantum information using principles from quantum mechanics. They utilize the properties of quantum systems, such as superposition and entanglement, to perform computations that would be infeasible for classical computers.
While quantum computers can interact with quantum systems and extract information from them, it's important to note that their operations are subject to the same laws of quantum mechanics as any other physical system. They do not possess any inherent special role as observers. The process of measurement or observation in quantum mechanics typically involves the coupling of a quantum system to a classical one, such as a measuring apparatus or a human observer, which leads to the collapse of the quantum state.
So, in summary, a quantum computer can interact with quantum systems and extract information from them, but it does not have a unique status as an observer in the context of quantum physics. The process of measurement and collapse of the wave function still requires a classical system to couple with the quantum system being observed.