Improving Quantum Parameter Estimation by Partial Measurements in Quantum Information Splitting

Abstract:

We realize the quantum information splitting with respect to phase parameter through the quantum channel with multi-partite entangled states in the condition of the environmental noise. The protocol of quanutm information splitting is that the information encoded in quantum parameters from a sender can be recovered at any one of many receivers by means of measurements. It is found that a general partial measurement can help to enhance the quantum Fisher information under the influence of amplitude-damping noise. In the Markovian case, the values of quantum Fisher information are decreased monotically.In the non-Markovian case, there exists the oscillation of quantum Fisher information.

Key words:quantum Fisher information, partial measurement,fidelity, quantum information splitting, multi-partite entangled state, quantum decoherence