Perovskites have recently emerged as novel functional materials owing to their unique properties. Nevertheless, current research and application have been restricted to the classical characters of their light responses. Preparation of many-body quantum states based on perovskites, and more importantly, investigation of the controllability of these many-body quantum behaviors to develop practical devices, constitute an interesting research topic.

The research team led by Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, together with East China Normal University and Hunan University, has recently demonstrated a cooperative quantum state of excitons in perovskite superlattice microcavity and extended the application to ultrafast quantum operation. The work was published in Nature Communication.

In this study, a new structure paradigm – ‘QD superlattice microcavity’ was developed. The highly symmetric, long-range ordered perovskite superlattice microcavity could ensure high coherence of collective quantum state and high stability in the switching process, facilitating ultrafast manipulation of macroscopic quantum state.

Moreover, by using a nonlinear detection technique combining the time-sequence control of multiple laser pulses, an evident quantum characteristic of perovskite system, in which the lasing behavior was not limited by the classical population-inversion condition, was demonstrated. Also, a perovskite quantum container based on a quantum-dot-assembly microcavity was achieved.

Such a micro integrated quantum device shows unique coding capacity of a tunable bandwidth up to 0.1 THz, which can find potential applications in ultrafast and photoelectric-compatible quantum processors.

These works were supported by the National Natural Science Foundation of China.

Terahertz conversion based on a CsPbBr₃ quantum dot superlattice microcavity. (Image by SIOM)

Article website:
https://www.nature.com/articles/s41467-019-14078-1

Contact:
Mr. CAO Yong
General Administrative Office
Shanghai Institute of Optics and Fine Mechanics, CAS
Email: caoyong@siom.ac.cn