Enhancing teleportation of quantum Fisher information by partial measurements

TL;DR

This paper proposes two schemes using partial measurements to enhance the teleportation of quantum Fisher information under noise, effectively combating decoherence and improving parameter estimation in quantum communication.

Contribution

It introduces novel partial measurement schemes that significantly improve QFI teleportation robustness against amplitude damping noise.

Findings

Post partial measurement greatly enhances teleported QFI.

Combining prior partial measurement with reversal eliminates decoherence effects.

Enhancing QFI teleportation is more economical than improving fidelity.

Abstract

The purport of quantum teleportation is to completely transfer information from one party to another distant partner. However, from the perspective of parameter estimation, it is the information carried by a particular parameter, not the information of total quantum state that needs to be teleported. Due to the inevitable noise in environment, we propose two schemes to enhance quantum Fisher information (QFI) teleportation under amplitude damping noise with the technique of partial measurements. We find that post partial measurement can greatly enhance the teleported QFI, while the combination of prior partial measurement and post partial measurement reversal could completely eliminate the effect of decoherence. We show that, somewhat consequentially, enhancing QFI teleportation is more economic than that of improving fidelity teleportation. Our work extends the ability of partial measurements as a quantum technique to battle decoherence in quantum information processing.