An Educational Approach to Quantum Decoherence via Single-Spin Noise Channels

As quantum technologies continue to advance, it becomes essential to integrate topics like decoherence into quantum-mechanics classes and provide students with opportunities to engage directly with quantum systems. Here we present an instructional approach to modeling quantum decoherence using the IBM quantum experience. Focusing on the simplest case of a single spin, we explore several common quantum noise channels, depolarizing, amplitude damping, dephasing, and thermalizing channels. These processes are first introduced through Lindblad operators and then translated to executable quantum circuits employing mid-circuit resets. This hands-on approach to decoherence helps students bridge the gap between theoretical concepts and experimental quantum information science.