Related papers: Initialization of Neutral and Charged Exciton Spin States in a Telecom-Emitting Quantum Dot

Initialization of Neutral and Charged Exciton Spin States in a Telecom-Emitting Quantum Dot

URL: http://arxiv.org/abs/2504.20497v1
Date: Tue, 29 Apr 2025 07:38:17 GMT
Title: Initialization of Neutral and Charged Exciton Spin States in a Telecom-Emitting Quantum Dot
Authors: Giora Peniakov, Johannes Michl, Mohamed Helal, Raphael Joos, Michael Jetter, Simone L. Portalupi, Peter Michler, Sven Höfling, Tobias Huber-Loyola,
Abstract summary: Photonic cluster states are highly entangled states that allow for photonic quantum computing and memory-less quantum repeaters.<n>A key ingredient that is still missing is an appropriate optical excitation method.<n>We report on developing such a method based on a quasi-resonant p-shell excitation for a telecom-C-band-emitting quantum dot.
Score: 0.0
License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
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 quasi-resonant p-shell excitation for a telecom-C-band-emitting quantum dot. 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, $T_{2}^{*}>6.4$ ns, boosting its candidacy as a sound photon entangler for more advanced quantum photonic schemes.

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