Which phenomenon causes the collapse of a quantum state (qubit) due to interaction with the environment?

💡 Explanation:

Quantum Decoherence is the process by which a quantum system, such as a qubit in superposition, loses its coherence (quantum nature) because of uncontrolled interaction with its surrounding environment (e.g., thermal vibrations, stray electromagnetic fields). This is the primary obstacle to developing stable, large-scale quantum computers. Entanglement is a useful quantum property.