Protecting quantum entanglement from amplitude damping

TL;DR

This paper introduces a protocol using Hadamard and CNOT gates to protect quantum entanglement from amplitude damping, avoiding weak measurements and enabling faster entanglement recovery, with a feasible linear optical implementation.

Contribution

The novel protocol protects entanglement without weak measurements, improving speed and practicality over existing methods.

Findings

Effective entanglement preservation demonstrated

No weak measurement required in the scheme

Feasible linear optical implementation proposed

Abstract

Quantum entanglement is a critical resource for quantum information and quantum computation. However, entanglement of a quantum system is subjected to change due to the interaction with the environment. One typical result of the interaction is the amplitude damping that usually results in the reduction of the entanglement. Here we propose a protocol to protect quantum entanglement from the amplitude damping by applying Hadamard and CNOT gates. As opposed to some recently studied methods, the scheme presented here does not require weak measurement in the reversal process, leading to a faster recovery of entanglement. We propose a possible experimental implementation based on linear optical system.