Abstract
We propose and analyze three electrically-pumped nanowire single-photon source structures, which achieve output efficiencies of more than 80%. These structures are based on a quantum dot embedded in a photonic nanowire with carefully tailored ends and optimized contact electrodes. Contrary to conventional cavity-based sources, this non-resonant approach provides broadband spontaneous emission control and features an improved fabrication tolerance towards surface roughness and imperfections. Using an element-splitting approach, we analyze the various building blocks of the designs with respect to realistic variations of the experimental fabrication parameters.
Highlights
The development of solid-state single-photon sources (SPSs) is a major challenge in the context of quantum communication, optical quantum information processing, and metrology [1]
The collection of photons can be strongly improved by inserting the quantum dot (QD) in a resonant optical microcavity and, up to very recently, this strategy has provided the most efficient SPS
Thanks to their spectrally-narrow emission lines at cryogenic temperatures, the spontaneous emission (SE) of QDs can be controlled through cavity quantum electrodynamical effects
Summary
The development of solid-state single-photon sources (SPSs) is a major challenge in the context of quantum communication, optical quantum information processing, and metrology [1] Such a source must implement a stable single-photon emitter with a high radiative yield. It is highly desirable to trigger the single-photon emission by an electrical pulse In this context, a semiconductor quantum dot (QD) is an attractive singlephoton emitter, which has a nearly perfect radiative yield and a stable emission (no blinking or bleaching). The collection of photons can be strongly improved by inserting the QD in a resonant optical microcavity and, up to very recently, this strategy has provided the most efficient SPS Thanks to their spectrally-narrow emission lines at cryogenic temperatures, the spontaneous emission (SE) of QDs can be controlled through cavity quantum electrodynamical effects. Ε remains so far limited to about 44% [10,11,15] for optically pumped SPSs and 34% for electrically pumped devices [7]
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