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

• URL: http://arxiv.org/abs/2306.08668v2
• Date: Tue, 16 Jan 2024 17:23:14 GMT
• Title: On-Demand Generation of Indistinguishable Photons in the Telecom C-Band using Quantum Dot Devices
• Authors: Daniel A. Vajner, Pawe{\l} Holewa, Emilia Zi\k{e}ba-Ost\'oj, Maja Wasiluk, Martin von Helversen, Aurimas Sakanas, Alexander Huck, Kresten Yvind, Niels Gregersen, Anna Musia{\l}, Marcin Syperek, Elizaveta Semenova, Tobias Heindel
• Abstract summary: We demonstrate the coherent on-demand generation of in photons in the telecom C-band from single QD devices. The research represents a significant advancement in photon-indistinguishability of single photons emitted directly in the telecom C-band.
• Score: 31.114245664719455
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Semiconductor quantum dots (QDs) enable the generation of single and entangled photons, 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 and 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 $4\pi$ 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 $\pi$-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.

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