两体耦合腔阵列的PT相变和单光子传输

PT phase transition and single-photon transmission in a coupled double-cavity array

以对称的光场增益和耗散的两体耦合腔阵列为研究对象,分析该体系的PT相变以及在PT对称相和对称破缺相中的单光子传输特点.结果表明,单光子传输在PT对称相中的周期性行为到PT对称破缺相中的非周期性行为的转变对应了PT相变;在两种情况下单光子传输都具有单向性,但是物理机制却不同.

Researches on the theory and experiment about the Parity-time symmetry（PT symmetry）systems have a considerable achievement.A coupled double-system array with the symmetrically optical loss and gain is discussed in this paper.The PT phase transition in such system is analyzed,as well as the single-photon transmission properties in the PT symmetric phase and the PT symmetry broken phase.The results show that the conversion from the periodic behavior of the single-photon transmission in the PT symmetric phase to the non-periodic behavior in the PT symmetry broken phase has revealed the PT phase transition.It is also obtained that the single-photon transmission is likewise unidirectional in both cases.However either follows the different physical mechanism.