On-Demand Generation of Indistinguishable Photons in the Telecom C-Band Using Quantum Dot Devices

Daniel A. Vajner, Paweł Holewa, Emilia Zięba-Ostój, Maja Wasiluk, Martin von Helversen, Aurimas Sakanas, Alexander Huck, Kresten Yvind, Niels Gregersen, Anna Musiał, Marcin Syperek, Elizaveta Semenova, Tobias Heindel*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Semiconductor quantum dots (QDs) enable the generation of single and entangled photons, which are useful for various applications in photonic quantum technologies. Specifically for quantum communication via fiber-optical networks, operation in the telecom C-band centered around 1550 nm is ideal. The direct generation of QD-photons in this spectral range with high quantum-optical quality, however, remained challenging. Here, we demonstrate the coherent on-demand generation of indistinguishable photons in the telecom C-band from single QD devices consisting of InAs/InP QD-mesa structures heterogeneously integrated with a metallic reflector on a silicon wafer. Using pulsed two-photon resonant excitation of the biexciton-exciton radiative cascade, we observe Rabi rotations up to pulse areas of 4π and a high single-photon purity in terms of g(2)(0) = 0.005(1) and 0.015(1) for exciton and biexciton photons, respectively. Applying two independent experimental methods, based on fitting Rabi rotations in the emission intensity and performing photon cross-correlation measurements, we consistently obtain preparation fidelities at the π-pulse exceeding 80%. Finally, performing Hong-Ou-Mandel-type two-photon interference experiments, we obtain a photon-indistinguishability of the full photon wave packet of up to 35(3)%, representing a significant advancement in the photon-indistinguishability of single photons emitted directly in the telecom C-band.

Original languageEnglish
JournalACS Photonics
Issue number2
Pages (from-to)339-347
Publication statusPublished - 2024


  • Coherent excitation
  • Quantum communication
  • Quantum dots
  • Single photon sources
  • Telecom C-band


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