Integrated Whispering-Gallery-Mode Resonator for Solid-State Coherent Quantum Photonics

Arianne Brooks, Xiao-Liu Chu*, Zhe Liu, Ruediger Schott, Arne Ludwig, Andreas D. Wieck, Leonardo Midolo, Peter Lodahl, Nir Rotenberg

*Corresponding author for this work

Research output: Contribution to journalLetterResearchpeer-review

9 Citations (Scopus)
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Abstract

Tailored photonics cavities enhance light-matter interactions, ultimately enabling a fully coherent quantum interface. Here, we report 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 +/- 0.9 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 reroute 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.

Original languageEnglish
JournalNano Letters
Volume21
Issue number20
Pages (from-to)8707-8714
Number of pages8
ISSN1530-6984
DOIs
Publication statusPublished - 27 Oct 2021

Bibliographical note

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Keywords

  • quantum nanophotonics
  • quantum dots
  • resonators
  • ATOM
  • CHIP

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