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Initialization of neutral and charged exciton spin states in a telecom-emitting quantum dot

Giora Peniakov1,*,†, Johannes M. Michl1,*, Mohamed Helal1, Raphael Joos2, Michael Jetter2, Simone L. Portalupi2, Peter Michler2, Sven Höfling1, and Tobias Huber-Loyola1

  • 1Julius-Maximilians-Universität Würzburg, Physikalisches Institut, Lehrstuhl für Technische Physik, Am Hubland, 97074 Würzburg, Germany
  • 2Institut für Halbleiteroptik und Funktionelle Grenzflächen (IHFG), Center for Integrated Quantum Science and Technology (IQST) and SCoPE, University of Stuttgart, Allmandring 3, 70569 Stuttgart, Germany

  • *These authors contributed equally to this work.
  • †Contact author: giora.peniakov@uni-wuerzburg.de
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Phys. Rev. B 112, 085422 – Published 25 August, 2025

DOI: https://doi.org/10.1103/3qh7-b696

Abstract

Photonic cluster states are highly entangled states that allow for photonic quantum computing and memory-less quantum repeaters. Their generation has been recently demonstrated using semiconductor quantum dots emitting at the 900 nm wavelength range. However, a similar demonstration at the communication-optimal telecom range has remained elusive. A key ingredient that is still missing is an appropriate optical excitation method. A central requirement of such a method is to allow an arbitrary spin initialization of quantum-dot excitonic complexes. In this work, we report on developing such a method based on a quasiresonant p-shell excitation for an InAs/InGaAs quantum dot emitting at 1535 nm. We show qubit writing of a neutral exciton and spin-preserving excitation of a negative trion. Using the Larmor precession of the negative trion under an externally applied magnetic field, we determine the in-plane g factors of both the electron and the hole in the investigated quantum dot. In addition, we measure a lower bound on the hole coherence time, T2*>6.4ns, boosting its candidacy as a sound photon entangler for more advanced quantum photonic schemes.

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Phys. Rev. B 112, 085422– Published 25 August, 2025
  • Received 6 May 2025
  • Accepted 8 July 2025
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

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