Protecting entanglement from correlated amplitude damping channel using weak measurement and quantum measurement reversal

TL;DR

This paper introduces a scheme using weak measurement and quantum measurement reversal to protect and even amplify entanglement in quantum systems affected by correlated amplitude damping decoherence, highlighting the importance of memory effects.

Contribution

It demonstrates a novel approach leveraging weak measurement techniques to mitigate entanglement loss in correlated noise environments, surpassing previous memoryless models.

Findings

Memory effects significantly suppress entanglement sudden death.

Initial entanglement can be probabilistically amplified.

The scheme effectively protects entanglement under severe decoherence.

Abstract

Based on the quantum technique of weak measurement, we propose a scheme to protect the entanglement from correlated amplitude damping decoherence. In contrast to the results of memoryless amplitude damping channel, we show that the memory effects play a significant role in the suppression of entanglement sudden death and protection of entanglement under severe decoherence. Moreover, we find that the initial entanglement could be drastically amplified by the combination of weak measurement and quantum measurement reversal even under the correlated amplitude damping channel. The underlying mechanism can be attributed to the probabilistic nature of weak measurements.