Nanocavity enhanced photon coherence of solid-state quantum emitters operating up to 30 K
arxiv(2023)
摘要
Solid-state emitters such as epitaxial quantum dots have emerged as a leading
platform for efficient, on-demand sources of indistinguishable photons, a key
resource for many optical quantum technologies. To maximise performance, these
sources normally operate at liquid helium temperatures (∼ 4 K),
introducing significant size, weight and power requirements that can be
impractical for proposed applications. Here we experimentally resolve the two
distinct temperature-dependent phonon interactions that degrade
indistinguishability, allowing us to demonstrate that coupling to a photonic
nanocavity can greatly improve photon coherence at elevated temperatures up to
30 K that are compatible with compact cryocoolers. We derive a
polaron model that fully captures the temperature-dependent influence of
phonons observed in our experiments, providing predictive power to further
increase the indistinguishability and operating temperature of future devices
through optimised cavity parameters.
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