Example Concept: Decoherence refers to the process by which a quantum system loses its coherent superposition state due to interactions with its environment, leading to errors in quantum computations. The coherence time of a qubit is a critical parameter, as it determines the time available for quantum operations before significant decoherence occurs. To mitigate decoherence, error correction codes and noise-resilient algorithms are employed, but these methods increase the circuit complexity and resource requirements.