Figure 2: Nucleation of two Φ-bits in space–time representation.
From: Topological solitons as addressable phase bits in a driven laser
(a) a phase perturbation is applied (black arrow) while the system is in a stable stationary locked state. Following that perturbation, a pulse is nucleated and repeats with a periodicity close to the feedback delay time, as shown in b. The space–time representation is chosen such that the pulse is almost stationary (see text). After some time a phase perturbation is applied again on the system (black arrow), with the first Φ-bit already stored. The two Φ-bits now propagate in the feedback loop, without perturbing each other (c,d). (e) superposition of a single Φ-bit waveform over 350 roundtrips. The very well-defined shape indicates the attractor nature of the Φ-bit. The ringing following the pulse is attributed to the detection set-up. (f) Evolution of the distance between the two pulses in the course of time.
