Improving the fidelity of teleportation through noisy channels using weak measurement

TL;DR

This paper demonstrates that applying weak measurement and reversal operations can preserve high teleportation fidelity over noisy channels, even under amplitude damping, outperforming traditional methods.

Contribution

It introduces a protocol using weak measurement to enhance teleportation fidelity in noisy environments, applicable to both maximally entangled and Werner states.

Findings

Fidelity exceeds 2/3 for any decoherence level.

Success probability decreases with measurement strength.

Protocol effective for Werner states too.

Abstract

We employ the technique of weak measurement in order to enable preservation of teleportation fidelity for two-qubit noisy channels. We consider one or both qubits of a maximally entangled state to undergo amplitude damping, and show that the application of weak measurement and a subsequent reverse operation could lead to a fidelity greater than $2/3$ for any value of the decoherence parameter. The success probability of the protocol decreases with the strength of weak measurement, and is lower when both the qubits are affected by decoherence. Finally, our protocol is shown to work for the Werner state too.