期刊
MATERIALS FOR QUANTUM TECHNOLOGY
卷 3, 期 4, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/2633-4356/acf5c0
关键词
indistinguishable; photons; quantum; emitters; temperature; dots; cavity
This study addresses the temperature-related issues in solid-state emitters and demonstrates that coupling to a photonic nanocavity can greatly enhance the photon coherence at elevated temperatures (up to 30K).
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 ( similar to 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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