Regensburg 2022 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 30: Poster 2

HL 30.6: Poster

Donnerstag, 8. September 2022, 11:00–13:00, P3

Telecom-band single photons from functionalized carbon nanotubes coupled to a an open cavity — •Lukas Husel¹, Julian Trapp¹, Xiaojian Wu², Manuel Nutz³, Thomas Hümmer³, YuHuang Wang², David Hunger⁴, and Alexander Högele^{1, 5} — ¹Ludwig-Maximilians-Universität, 80539 München — ²University of Maryland, 20742 Maryland, USA — ³Qlibri GmbH, 80337 München — ⁴Karlsruher Institut für Technologie, 76131 Karlsruhe — ⁵Munich Center for Quantum Science and Technology, 80799 München

Quantum light at telecom wavelengths is of fundamental relevance in science and technology. A promising room temperature source of telecom single photons are functionalized carbon nanotubes (CNTs). In this system, dephasing and spectral diffusion limit spectral purity and indistinguishability of the generated photons, which can in principle be overcome by coupling the emitters to a cavity. Here, we demonstrate spectrally narrow single photon emission at wavelengths around 1460 nm from single CNT defects coupled to a fiber-based Fabry-Pérot resonator. We operate the cavity at ambient conditions and in the regime of low Purcell enhancement. By changing the cavity length, we tune the emission wavelength over a range of tens of nm, and the power spectral density by a factor of six. The coherence time of the generated photons matches the cavity linewidth, which constitutes an increase compared to the expected dephasing-limited free-space linewidth. Our results represent a step towards CNT-based sources of telecom-band single photons with high purity and indistinguishability.