An integrated whispering-gallery-mode resonator for solid-state coherent quantum photonics

• URL: http://arxiv.org/abs/2107.12188v2
• Date: Tue, 27 Jul 2021 13:21:51 GMT
• Title: An integrated whispering-gallery-mode resonator for solid-state coherent quantum photonics
• Authors: Arianne Brooks, Xiao-Liu Chu, Zhe Liu, Rudiger Schott, Arne Ludwig, Andreas D. Wieck, Leonardo Midolo, Peter Lodahl and Nir Rotenberg
• Abstract summary: We report on an integrated microdisk cavity containing self-assembled quantum dots to coherently route photons. We show how this integrated system can coherently re-route photons between the drop and bus ports. We discuss the strengths and limitations of this approach, focusing on how it can be used to increase the efficiency of quantum devices.
• Score: 6.082529164787429
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Tailored photonic cavities allow enhancing light-matter interaction ultimately to create a fully coherent quantum interface. Here, we report on an integrated microdisk cavity containing self-assembled quantum dots to coherently route photons between different access waveguides. We measure a Purcell factor of $F_{exp}=6.9\pm0.9$ for a cavity quality factor of about 10,000, allowing us to observe clear signatures of coherent scattering of photons by the quantum dots. We show how this integrated system can coherently re-route photons between the drop and bus ports, and how this routing is controlled by detuning the quantum dot and resonator, or through the strength of the excitation beam, where a critical photon number less than one photon per lifetime is required. We discuss the strengths and limitations of this approach, focusing on how the coherent scattering and single-photon nonlinearity can be used to increase the efficiency of quantum devices such as routers or Bell-state analyzers.

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