Abstract
A scheme of quantum feedback control with an optimal cloning machine is proposed. The design of quantum feedback control algorithms is separated into a state recognition strategy, which gives “on-off” signal to the actuator through recognizing some copies from cloning machine, and a feedback (control) strategy through feeding back the another copies of cloning machine. Precise feedback is abandoned and a compromise between information acquisition and measurement disturbance is established. The recognition process involves measurement and is destructive, however, the feedback step without measurement is preserving quantum coherence, so the scheme can perform some quantum control tasks with coherent feedback.
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