A protocol of quantum dense coding protection of two qubits is proposed in amplitude damping (AD) channel using weak measurement and reversal measurement. It is found that the capacity of quantum dense coding under the weak measurement and reversal measurement is always greater than that without weak measurement and reversal measurement. When the protocol is applied, for the AD channels with different damping coefficient, the result reflects that quantum entanglement can be protected and quantum dense coding becomes successful.In recent years, with the development of quantum mechanics and the establishment of quantum information science, quantum entanglement becomes a new research hotspot of theoretical physics. Quantum entanglement, which is a key part of quantum information processing[1], including quantum teleportation[2-3], quantum computing[4], quantum cryptography[5], quantum dense coding[6] and quantum secret sharing [7]. However, in realistic quantum information processing, entanglement is inevitably affected by the interaction between the system and environment, which leads to degradation. Furthermore, entanglement sudden death (ESD) [8][9][10][11] will appear in this case. Thus, it is very important to protect entanglement in quantum information processing.
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