Example Concept: In superconducting qubits, noise primarily arises from decoherence and gate errors due to interactions with the environment and imperfections in control pulses. Trapped ions face noise from motional heating and laser fluctuations, while photonic qubits deal with loss and imperfect state preparation. These noise sources reduce gate fidelity by introducing errors that deviate the qubits from their intended states, necessitating error correction and mitigation strategies to maintain computational accuracy.