Reversibility of Weak Measured Quantum Entanglement States
Quantum entangled states,as an important resource for quantum communication and information,can obtain relevant information about their quantum states can be measured to obtain.Projection measurement can cause the initial state to collapse to one of its eigenstate.It cannot be used to reverse the measured quantum state to its initial state.If the weak measurement operation is applied to the quantum entangled state and the corresponding reversibility operation is used to explore the elimination effect of its weak measurement on the perturbation of the quantum entangled state,it has certain significance.Therefore,the study of the reversibility of quantum entangled states under different initial conditions after weak measurement and analyzing the feasibility of inverting the quantum entangled state after weak measurement operation to its initial state after reversibility operation is significant.Using weak measurement schemes and reversible operations,numerical analysis of the weak measured quantum state is theo-retically carried out,exploring the realization of the inversion of the weak measured quantum state.By implementing revers-ible operation on the quantum entanglement state after weak measurement operation,this work mainly explores the reversal behavior of the entanglement strength of the quantum entangled state.Concurrence is used to measure the entanglement strength of quantum entanglement states before and after weak measurement.And the entanglement strength of the initial quantum entangled state and the entanglement strength after weak measurement operation are analyzed.Taking a two-body quantum entangled state as an example,two entangled two-level atoms are respectively placed in a high-quality vacuum cavity field.By considering the weak measurement and reversible operation to one atom,we explore the dynamic characteristics of the two-body system quantum entangled state under this scheme.The numerical analysis results show that the entanglement strength of the quantum state after weak measurement can be fully reversed to its initial value through an appropriate reversibility operation.That is to say,the interference of weak measurement on quantum state can be repaired through the reversible operation.
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