Cavity-enhanced photon indistinguishability at room temperature and telecom wavelengths

Lukas Husel, Julian Trapp, Johannes Scherzer, Xiaojian Wu, Peng Wang, Jacob Fortner, Manuel Nutz, Thomas Hümmer, Borislav Polovnikov, Michael Förg, David Hunger (), YuHuang Wang () and Alexander Högele ()
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Lukas Husel: Ludwig-Maximilians-Universität München
Julian Trapp: Ludwig-Maximilians-Universität München
Johannes Scherzer: Ludwig-Maximilians-Universität München
Xiaojian Wu: University of Maryland
Peng Wang: University of Maryland
Jacob Fortner: University of Maryland
Manuel Nutz: Qlibri GmbH
Thomas Hümmer: Qlibri GmbH
Borislav Polovnikov: Ludwig-Maximilians-Universität München
Michael Förg: Qlibri GmbH
David Hunger: Karlsruhe Institute of Technology
YuHuang Wang: University of Maryland
Alexander Högele: Ludwig-Maximilians-Universität München

Nature Communications, 2024, vol. 15, issue 1, 1-7

Abstract: Abstract Indistinguishable single photons in the telecom-bandwidth of optical fibers are indispensable for long-distance quantum communication. Solid-state single photon emitters have achieved excellent performance in key benchmarks, however, the demonstration of indistinguishability at room-temperature remains a major challenge. Here, we report room-temperature photon indistinguishability at telecom wavelengths from individual nanotube defects in a fiber-based microcavity operated in the regime of incoherent good cavity-coupling. The efficiency of the coupled system outperforms spectral or temporal filtering, and the photon indistinguishability is increased by more than two orders of magnitude compared to the free-space limit. Our results highlight a promising strategy to attain optimized non-classical light sources.

Date: 2024
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DOI: 10.1038/s41467-024-48119-1

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