Fig. 3: Simulation of the amplitude damping channel.
From: IBM Q Experience as a versatile experimental testbed for simulating open quantum systems
a Markovian dynamics (\(R=0.2\)). b Non-Markovian dynamics (\(R=100\)). Blue triangles show the measured populations of the excited state as a function of time, whereas orange circles stand for the non-Markovianity witness, given by the probability of observing the system and an ancilla, initially prepared in the state \(\left|{\phi }^{+}\right\rangle\), in that same state as the channel acts on the system (see Methods for further details). In b, the experimental results clearly show a non-monotonic behaviour, hence confirming the non-Markovian character of the dynamical map. Dashed lines show the theoretical predictions for both quantities.
