Figure 6.

Autonomous polarization basis alignment under Assumptions I and II. Without any prior information, autonomous alignment should be possible by gradually rotating one of the half-wave plates. (a) However, due to the error signals that sometimes occur even when the polarization bases are aligned, the mechanism does not work well since the system passes through the optimal situation. (b) By referring to the recent history of the events involving decision conflict, robustness against errors is accomplished. (c) With too much reference to past events, the reaction becomes very slow.