Extension of coherent response time is a desired goal in the field of all-optical information processing implemented in classical and quantum ways. Here we demonstrate how spin-dependent stimulated photon echo can be used to extend decay time of coherent signal from exciton ensemble. We experimentally studied photon echoes from excitons in a model single InGaAs/GaAs quantum well subject to transverse magnetic field. Field-induced quantum beats lead to oscillation of exciton population between bright and long-lived dark excitons. As a result, photon echo decays much longer with decay time attaining dark exciton lifetime in case of non-oscillatory regime.
@article{arxiv.2312.03156,
title = {Optical coherence storage in dark exciton states using spin-dependent three-pulse photon echo},
author = {I. A. Solovev and R. S. Nazarov and A. A. Butiugina and S. A. Eliseev and V. A. Lovcjus and Yu. P. Efimov and Yu. V. Kapitonov and I. A. Yugova},
journal= {arXiv preprint arXiv:2312.03156},
year = {2023}
}