Protecting Entanglement and Fidelity of Cluster States by Weak Measurement and Reversal

Abstract

The protection of entanglement and fidelity of cluster states under amplitude damping decoherence by means of weak measurement is investigated. Employing the prior weak measurement and post weak measurement reversal, the decoherence of system can be prohibited effectively, and the fidelity is improved obviously. Besides, the evolution of entanglement and fidelity are dependent on the weak measurement strength P. By choosing some proper values of P, the entanglement and fidelity can be protected optimally.