Discriminating qubit amplitude damping channels

Understand

We address the issue of the discrimination between two-qubit amplitude damping channels by exploring several strategies.

• For the single-shot, we show that the excited state does not always give the optimal input, and that side entanglement assistance has limited benefit.
• On the contrary, feedback assistance from the environment is more beneficial.
• For the two-shot, we prove the in-utility of entangled inputs.