Figure 3: Control of Φ-bits.
From: Topological solitons as addressable phase bits in a driven laser
(a) Seven Φ-bits initially co-exist in the feedback loop. The six remaining bits reorganize in the course of time after cancellation of the central one. (b) Six Φ-bits are present in the feedback loop. A perturbation (black arrow) is applied and nucleates a seventh Φ-bit. The two nearest neighbour repel each other until they reach sufficient time separation (790 ps) but the other existing Φ-bits are not affected. (c) Many perturbations (black arrows) are applied successively in time and nucleate several Φ-bits starting from the homogeneous state. Existing Φ-bits can be canceled if they are hit by a phase perturbation as shown at approximate coordinates (6;40) and (8;40). In this case, a nonmonotonous sequence of 13 different 8-bit integers has been stored. The same perturbation parameters are used for nucleation and cancellation. Note that the feedback loop is three times larger in b,c than in a.
