Fig. 2: Simulation of a collisional model.
From: IBM Q Experience as a versatile experimental testbed for simulating open quantum systems
The red triangles show the collisions with the ancillae prepared in a classically correlated state (red triangles), while the blue dots show the case of a separable state. In both cases \(g=1\), \(\tau =\pi /6\) (weak-coupling regime). The red and blue dashed curves show, respectively, the theoretical predictions of Eqs. (5) and (6) for time \(t=ng\tau\). Up to 7 collisions were simulated: the depth of the circuits grows with the number of collisions, causing increasing decoherence, but the oscillations due to the essential non-Markovianity are clearly visible in the case of correlated ancillae.
