Example Concept: Decoherence is the process by which a quantum system loses its quantum properties due to interaction with its environment. In larger quantum circuits, the increased number of qubits and gates leads to more opportunities for such interactions, as each qubit and gate can introduce noise and errors. This results in the system's wave function collapsing into a classical state, reducing the fidelity of quantum computations. The challenge is to design circuits and error correction techniques that minimize these interactions and maintain coherence over longer computation times.