Purcell-enhanced single-photon emission from InAs/GaAs quantum dots coupled to broadband cylindrical nanocavities
Abstract
On-chip emitters that can generate single and entangled photons are essential building blocks for developing photonic quantum information processing technologies in a scalable fashion. Semiconductor quantum dots (QDs) are attractive candidates that emit high-quality quantum states of light on demand, however at a rate limited by their spontaneous radiative lifetime. In this study, we utilize the Purcell effect to demonstrate up to a 38-fold enhancement in the emission rate of InAs QDs by coupling them to metal-clad GaAs nanopillars. These cavities, featuring a sub-wavelength mode volume of 4.5x10-4 ({\lambda}/n)3 and low quality factor of 62, enable Purcell-enhanced single-photon emission across a large bandwidth of 15 nm. The broadband nature of the cavity eliminates the need for implementing tuning mechanisms typically required to achieve QD-cavity resonance, thus relaxing fabrication constraints. Ultimately, this QD-cavity architecture represents a significant stride towards developing solid-state quantum emitters generating near-ideal single-photon states at GHz-level repetition rates.
Cite
@article{arxiv.2407.11642,
title = {Purcell-enhanced single-photon emission from InAs/GaAs quantum dots coupled to broadband cylindrical nanocavities},
author = {Abhiroop Chellu and Subhajit Bej and Hanna Wahl and Hermann Kahle and Topi Uusitalo and Roosa Hytönen and Heikki Rekola and Jouko Lang and Eva Schöll and Lukas Hanschke and Patricia Kallert and Tobias Kipp and Christian Strelow and Marjukka Tuominen and Klaus D. Jöns and Petri Karvinen and Tapio Niemi and Mircea Guina and Teemu Hakkarainen},
journal= {arXiv preprint arXiv:2407.11642},
year = {2025}
}
Comments
v2: Minor changes have been made to the manuscript after v1: Title has been modified. Reference number 42 and 62 updated. The manuscript has been edited to improve the general readability of the text v3: A comprehensive discussion on the collection efficiency of this QD-cavity source has been added in the "Discussions" section of the manuscript. Figure 1 and Figure 6 have been updated