We study the evolution of the squeezing quantified by entropy squeezing in an amplitude damping model consisting of N noninteracting qubits coupled to a common reservoir. We demonstrate that even in the Markovian regime the squeezing of considered qubit system can be effectively protected by selecting the number of qubits in reservoir. Especially, the steady squeezing of a qubit system can be obtained for the Markivan and non-Markovian regimes. The corresponding physical mechanism for enhancing the squeezing is also given. We also compare the differences between the considered amplitude damping model and other two types of amplitude damping models for the conditions of squeezing-protection, and find that although one use different methods to improve the squeezing they can be explained by a unified physical mechanism.

我们研究了在由N组成的振幅阻尼模型中通过熵压缩量化的压缩的演变非相互作用的量子位耦合到一个共同的水库。我们证明，即使在马尔可夫制度中，也可以通过选择库中的量子位数量来有效地保护所考虑的量子位系统的压缩。特别是，对于马尔基万和非马尔可夫体制，可以获得量子位系统的稳定挤压。还给出了相应的增强挤压的物理机制。我们还比较了所考虑的振幅阻尼模型与其他两种振幅阻尼模型在挤压保护条件下的差异，发现虽然使用不同的方法来改善挤压，但它们可以用统一的物理机制来解释。