Interaction induced non-reciprocal three-level quantum transport

Besides its fundamental importance, non-reciprocity has also found many potential applications in quantum technology. Recently, many quantum systems have been proposed to realize non-reciprocity, but stable non-reciprocal process is still experimentally difficult in general, due to the needed cyclical interactions in artificial systems or operational difficulties in solid state materials. Here, we propose a new kind of interaction induced non-reciprocal operation, based on the conventional stimulated-Raman-adiabatic-passage(STIRAP) setup, which removes the experimental difficulty of requiring cyclical interaction, and thus it is directly implementable in various quantum systems. Furthermore, we also illustrate our proposal on a chain of three coupled superconducting transmons, which can lead to a non-reciprocal circulator with high fidelity without a ring coupling configuration as in the previous schemes or implementations. Therefore, our protocol provides a promising way to explore fundamental non-reciprocal quantum physics as well as realize non-reciprocal quantum device.     

锥形光纤激发盘腔光学模式互易性研究

光学谐振腔由于其高Q值特性,作为谐振式陀螺的核心元件,有望实现谐振式陀螺的小型化、集成化,但是非互易性噪声成为制约其精度提高的不利因素. 介绍了采用传统半导体工艺制备的盘型腔与熔融法拉制的锥形光纤组成的耦合系统. 当盘型腔在光纤锥区的不同位置进行耦合谐振时,将输入输出正/反对调,观察到输出透射谱发生偏差,谐振频率、耦合效率以及Q值均发生变化,即存在非互易性现象. 用Rsoft软件对锥形光纤倏逝场分布特性进行仿真,理论分析了非互易性产生的原因. 以此可抑制谐振式光学陀螺应用中由锥形光纤与谐振腔组成的耦合系统产生的非互易性噪声. 关键词： 光学谐振腔 锥形光纤 非互易性 谐振式陀螺     

Optical Non-Reciprocity in Coupled Resonators by Detailed Balance

Inspired by the photosynthetic energy transfer process, a method to realize non-reciprocal optical transmission in an array of coupled resonators is theoretically proposed. The optical non-reciprocity of the coupled resonators arises from the frequency gradient between adjacent cavities and the interaction with the environment, which is similar to photosynthetic energy transfer. An increase in the frequency gradient or the number of the cavities can lead to better non-reciprocity. However, although a higher environment temperature will increase the total photon number in the coupled cavities, non-reciprocity will be weakened. All these findings can be well described by the detailed balance. The similarity between the noise-induced optical non-reciprocity and exciton energy transfer in natural photosynthesis is revealed by the discovery.