Entangled states with high-dimensional systems have been investigated widely because of their extended possibilities. We investigate the entanglement protection of a qubit–qutrit system under amplitude damping decoherence by employing non-Hermitian operation. We find that the qubit–qutrit entanglement decays monotonically as the decoherence strength increases, and may go through a sudden death for strong decoherence strength. However, we can completely defeat amplitude damping decoherence and recover or even magnify the initial entanglement perfectly by means of non-Hermitian operation. In particular, the non-Hermitian operation can protect entanglement more efficiently in the case of strong decoherence strength than those with small decoherence strength.

具有高维系统的纠缠态因其扩展的可能性而被广泛研究。我们通过采用非厄米运算研究了在振幅阻尼退相干下量子位-qutrit 系统的纠缠保护。我们发现 qubit-qutrit 纠缠随着退相干强度的增加而单调衰减，并且可能会突然死亡以获得强退相干强度。然而，我们可以完全克服振幅阻尼退相干，并通过非厄米运算完美地恢复甚至放大初始纠缠。特别是非厄米运算在退相干强度强的情况下比退相干强度小的情况更能有效地保护纠缠。