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Propagation and ramification of a solitary pulse through an environmentally coupled qubit
New Journal of Physics ( IF 3.3 ) Pub Date : 2020-10-19 , DOI: 10.1088/1367-2630/abbca4 Yibo Gao 1 , Shijie Jin 1 , Hou Ian 2, 3
New Journal of Physics ( IF 3.3 ) Pub Date : 2020-10-19 , DOI: 10.1088/1367-2630/abbca4 Yibo Gao 1 , Shijie Jin 1 , Hou Ian 2, 3
Affiliation
Using a microscopic master equation to account for the environmental effects, we compute the decoherence culminated during the propagation of a microwave pulse of arbitrary shape through a superconducting qubit. It is shown that the qubit decoherence vanishes and the pulse shape remains absorption-free when the latter adopts a soliton shape with $n\pi$ area. Otherwise, the environmental feedback decelerates the velocity of the soliton envelop and induces an monotonic increase of phase in the microwave. A pulse of non-$n\pi$ area thus ramifies into a transparent part that travels decoherence-free at incident velocity and a slowing part that decays through space. The ramification explains the environmental origin of pulse splitting observed in self-induced transparency.
中文翻译:
通过环境耦合量子位传播和分枝一个孤立脉冲
使用微观主方程来解释环境影响,我们计算了在任意形状的微波脉冲通过超导量子位传播过程中达到的退相干。结果表明,当后者采用具有 $n\pi$ 面积的孤子形状时,量子位退相干消失并且脉冲形状保持无吸收。否则,环境反馈会降低孤子包络的速度,并导致微波中的相位单调增加。因此,非 $n\pi$ 区域的脉冲会分成一个透明的部分,该部分以入射速度无退相干传播,另一部分在空间中衰减。其结果解释了在自诱导透明度中观察到的脉冲分裂的环境起源。
更新日期:2020-10-19
中文翻译:
通过环境耦合量子位传播和分枝一个孤立脉冲
使用微观主方程来解释环境影响,我们计算了在任意形状的微波脉冲通过超导量子位传播过程中达到的退相干。结果表明,当后者采用具有 $n\pi$ 面积的孤子形状时,量子位退相干消失并且脉冲形状保持无吸收。否则,环境反馈会降低孤子包络的速度,并导致微波中的相位单调增加。因此,非 $n\pi$ 区域的脉冲会分成一个透明的部分,该部分以入射速度无退相干传播,另一部分在空间中衰减。其结果解释了在自诱导透明度中观察到的脉冲分裂的环境起源。