Feedback preparation of maximally entangled states of two‐qubit systems
Juan Zhou, Sen Kuang · IET Control Theory and Applications · 2016
Bell states play a central role in the field of quantum information. For two‐qubit systems, this study proposes a new non‐smooth control strategy within the theoretical framework of quantum continuous measurement, and achieves global feedback stabilisation in any target Bell state. For a target Bell state, the authors select one measured observable and two control channels, where the control law associated with one channel is kept constant. They design a non‐smooth control law for the other control channel, and prove the stability of the whole closed‐loop system. Some simulation experiments show that the control strategy in this paper has a good control effect.