如果我们说的是，第四激发态，我们用，主量子数来描述，哪个主量子数对应了，氢原子的第四激发态？
So if we're talking about the fourth excited state, and we talk instead about principle quantum numbers, what principle quantum number corresponds to the fourth excited state of a hydrogen atom.
另外，在第四章中，我们详细讨论了混态对量子隐形传态的影响，并研究了对混态进行纯化后隐形传态的保真度问题。
In addition, in the fourth chapter, we discussed the impact which mixed states made on quantum teleportation in detail, also we studied the fidelity after teleportation the purified mixed states.
第四章讨论了序贯指数模型的极大似然估计的强相合性和渐近正态性，并进行了证明。
In Chapter 4, we discuss and prove the consistency and asymptotic normality of maximum likelihood estimate to the exponential models.
第四章研究了纠缠相干态作为分束器的输入态时，分束器对光场纠缠、反聚束、单模压缩、和压缩、差压缩等非经典特性的影响。
We show that the entanglement is affected by the BS when the input state of the BS is the entangled coherent state (ECS).
第四章研究了纠缠相干态作为分束器的输入态时，分束器对光场纠缠、反聚束、单模压缩、和压缩、差压缩等非经典特性的影响。
We show that the entanglement is affected by the BS when the input state of the BS is the entangled coherent state (ECS).
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