Open AccessMeasurement of the inhomogeneous broadening of a bi-exciton state in a quantum dot using Franson-type nonlocal interference
Author(s) -
Yong-Nan Sun,
Yang Zou,
Geng Chen,
JianShun Tang,
Haiqiao Ni,
Mi-Feng Li,
Guo-Wei Zha,
Zhichuan Niu,
YongJian Han,
ChuanFeng Li,
GuangCan Guo
Publication year - 2017
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.25.001778
Subject(s) - physics , exciton , homogeneous broadening , biexciton , quantum dot , photon , quantum mechanics , interference (communication) , cascade , doppler broadening , spectral line , chemistry , channel (broadcasting) , chromatography , electrical engineering , engineering
The inhomogeneous broadening of the bi-exciton state in quantum dots, i.e., the inhomogeneous broadening of the upper level of the cascade process, is not only a fundamental problem in quantum dots, but also closely related with the coherent control of this complex system and the quality of the entangled photon pairs, especially the time-bin entangled photon pairs. This inhomogeneous broadening is inherently a two-photon correlated phenomenon. In this work, we construct a genuine Franson-type nonlocal interference process to measure the inhomogeneous broadening of the bi-exciton state. The results show that the inhomogeneous broadening of the bi-exciton state is considerably smaller than that of the exciton state, that is why the entangled photon pairs can be generated by the cascade process in the quantum dot.