A Fiber-pigtailed Quantum Dot Device Generating Indistinguishable Photons at GHz Clock-rates

• URL: http://arxiv.org/abs/2409.08982v1
• Date: Fri, 13 Sep 2024 16:55:36 GMT
• Title: A Fiber-pigtailed Quantum Dot Device Generating Indistinguishable Photons at GHz Clock-rates
• Authors: Lucas Rickert, Kinga Żołnacz, Daniel A. Vajner, Martin von Helversen, Sven Rodt, Stephan Reitzenstein, Hanqing Liu, Shulun Li, Haiqiao Ni, Paweł Wyborski, Grzegorz Sęk, Anna Musiał, Zhichuan Niu, Tobias Heindel,
• Abstract summary: We present a fiber-pigtailed cavity-enhanced source of flying qubits emitting single indistinguishable photons at clock-rates exceeding 1 GHz. Results show that fiber-pigtailed quantum light sources based on hCBG cavities are a prime candidate for applications of quantum information science.
• Score: 0.507214623687214
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Solid-state quantum light sources based on semiconductor quantum dots (QDs) are increasingly employed in photonic quantum information applications. Especially when moving towards real-world scenarios outside shielded lab environments, the efficient and robust coupling of nanophotonic devices to single-mode optical fibers offers substantial advantage by enabling "plug-and-play" operation. In this work we present a fiber-pigtailed cavity-enhanced source of flying qubits emitting single indistinguishable photons at clock-rates exceeding 1 GHz. This is achieved by employing a fully deterministic technique for fiber-pigtailing optimized QD-devices based on hybrid circular Bragg grating (hCBG) micro-cavities. The fabricated fiber-pigtailed hCBGs feature radiative emission lifetimes of $<$80 ps, corresponding to a Purcell factor of $\sim$9, a suppression of multiphoton emission events with $g^{(2)}$(0) $<$1%, a photon-indistinguishability >80% and a measured single-photon coupling efficiency of 53% in a high numerical aperture single-mode fiber, corresponding to 1.2 Megaclicks per second at the single-photon detectors. Our results show that fiber-pigtailed quantum light sources based on hCBG cavities are a prime candidate for applications of quantum information science.

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