access icon free Feedback preparation of maximally entangled states of two-qubit systems

© The Institution of Engineering and Technology
Received 22/03/2015, Accepted 01/11/2015, Revised 19/07/2015, Published 05/02/2016

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.

Inspec keywords: stability; feedback; continuous time systems; closed loop systems; discrete time systems; control system synthesis; observability

Other keywords: two-qubit systems; target Bell state; maximally entangled states; measured observable channel; nonsmooth control strategy; quantum continuous measurement; closed-loop system stability; control channel; feedback analysis; quantum information; nonsmooth control law design; global feedback stabilisation

Subjects: Discrete control systems; Control system analysis and synthesis methods; Stability in control theory

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