Nanocavity enhanced photon coherence of solid-state quantum emitters operating up to 30 K

• URL: http://arxiv.org/abs/2305.05636v2
• Date: Wed, 8 May 2024 14:58:50 GMT
• Title: Nanocavity enhanced photon coherence of solid-state quantum emitters operating up to 30 K
• Authors: Alistair J. Brash, Jake Iles-Smith,
• Abstract summary: We experimentally resolve the two distinct temperature-dependent phonon interactions that degrade indistinguishability. We show that coupling to a photonic nanocavity can greatly improve photon coherence at elevated temperatures. We derive a polaron model that fully captures the temperature-dependent influence of phonons observed in our experiments.
• Score: 0.0
• License: http://creativecommons.org/licenses/by-nc-sa/4.0/
• Abstract: 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 ($\sim 4~\mathrm{K}$), 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 $30~\mathrm{K}$ 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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