Related papers: A Spin-Photon Interface in the Telecom C-Band with Long Hole Spin Dephasing Time

A Spin-Photon Interface in the Telecom C-Band with Long Hole Spin Dephasing Time

URL: http://arxiv.org/abs/2512.19561v1
Date: Mon, 22 Dec 2025 16:43:39 GMT
Title: A Spin-Photon Interface in the Telecom C-Band with Long Hole Spin Dephasing Time
Authors: Johannes M. Michl, Reza Hekmati, Mohamed Helal, Giora Peniakov, Yorick Reum, Jochen Kaupp, Quirin Buchinger, Jaewon Kim, Andreas T. Pfenning, Yong-Hoon Cho, Sven Höfling, Tobias Huber-Loyola,
Abstract summary: InAs/InAlGaAs quantum dots integrated in a deterministically placed circular Bragg grating emitting at $1.55.<n>We quantify the g-factors of electrons and holes from polarization-resolved measurements of a positive trion in an in-plane magnetic field.<n>We then herald the hole spin in a pulsed two-photon correlation measurement and determine its inhomogeneous dephasing time to $T_2*= (15.9 pm 1.7)$ ns.
Score: 1.9696871107017768
License: http://creativecommons.org/licenses/by/4.0/
Abstract: Matter qubits that maintain coherence over extended timescales are essential for many pursued applications in quantum communication and quantum computing. Significant progress has already been made on extending coherence times of spins in semiconductor quantum dots while interfacing them with photons in the near-infrared wavelength range. However, similar results for quantum dots emitting at the telecom range, crucial for many applications, have so far lagged behind. Here, we report on InAs/InAlGaAs quantum dots integrated in a deterministically placed circular Bragg grating emitting at $1.55\,μ\mathrm{m}$. We quantify the g-factors of electrons and holes from polarization-resolved measurements of a positive trion in an in-plane magnetic field and study the dynamics of the ground-state hole spin qubit. We then herald the hole spin in a pulsed two-photon correlation measurement and determine its inhomogeneous dephasing time to $T_{2}^{*}=(15.9 \pm 1.7)$ ns.

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