查看更多>>摘要：We present a novel feedback control method for quantum systems.Feed-back does not affect the controlled system itself.Instead,it controls the unravelling of the quantum channel of interaction between the system and its environment.This interaction can be represented as a history of events.If their informational content is changed,their back-action on the system is also modified.Feedback action is trigged by the events,thus granting the system the degree of control over its own state.The efficiency of the proposed scheme is demonstrated on the example of two-mode atomic Bose-Einstein condensate,with one of its modes subject to phase-contrast imaging in a Mach-Zehnder interferometer.The histories of photocounts in the output channels of the interferometer are used for feedback.Its capabilities of state engineering are studied for different settings of the feedback loop and different numbers of events in the recorded histories.
查看更多>>摘要：Whether the complex game system composed of a large number of artificial intelligence(AI)agents empowered with reinforcement learning can produce extremely favorable collective behaviors just through the way of agent self-exploration is a matter of practical importance.In this paper,we address this question by combining the typical theoretical model of resource allocation system,the minority game model,with reinforcement learning.Each individual participating in the game is set to have a certain degree of intelligence based on reinforcement learning algorithm.In particular,we demonstrate that as AI agents gradually becomes familiar with the unknown environment and tries to provide optimal actions to maximize payoff,the whole system continues to approach the optimal state under certain parameter combinations,herding is effectively suppressed by an oscillating collective behavior which is a self-organizing pattern without any external interference.An interesting phenomenon is that a first-order phase transition is revealed based on some numerical results in our multi-agents system with reinforcement learning.In order to further understand the dynamic behavior of agent learning,we define and analyze the conversion path of belief mode,and find that the self-organizing condensation of belief modes appeared for the given trial and error rates in the AI system.Finally,we provide a detection method for period-two oscillation collective pattern emergence based on the Kullback-Leibler divergence and give the parameter position where the period-two appears.
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