Zeyang Liao, M. Al-Amri, M. Suhail Zubairy
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 protecting 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 and therefore can recover the entanglement faster. We also propose a possible experimental implementation based on linear optical system. In addition, we also discuss an extended scheme to improve the entanglement protection.
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http://arxiv.org/abs/1208.4187
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