Related papers: An entangled photon source for the telecom C-band based on a semiconductor-confined spin

An entangled photon source for the telecom C-band based on a semiconductor-confined spin

URL: http://arxiv.org/abs/2507.01648v1
Date: Wed, 02 Jul 2025 12:22:19 GMT
Title: An entangled photon source for the telecom C-band based on a semiconductor-confined spin
Authors: Petros Laccotripes, Junyang Huang, Ginny Shooter, Andrea Barbiero, Matthew S. Winnel, David A. Ritchie, Andrew J. Shields, Tina Muller, R. Mark Stevenson,
Abstract summary: Multiphoton entangled states are a key resource for quantum networks and measurement-based quantum computation.<n>We take a key step towards the generation of telecom wavelength multi-qubit entangled states using an InAs/InP quantum dot.
Score: 0.07255608805275864
License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Abstract: Multiphoton entangled states are a key resource for quantum networks and measurement-based quantum computation. Scalable protocols for generating such states using solid-state spin-photon interfaces have recently emerged, but practical implementations have so far relied on emitters operating at short wavelengths, incompatible with low-loss fibre transmission. Here, we take a key step towards the generation of telecom wavelength multi-qubit entangled states using an InAs/InP quantum dot. After establishing that all essential criteria for generating cluster states using a ground state spin as the entangler are satisfied, we implement a scalable protocol to entangle the resident spin with sequentially emitted photons directly in the telecom C-band. We demonstrate a two-qubit (spin-photon) entanglement fidelity of $59.5\pm 8.7\%$ and a lower bound of three-qubit (spin-photon-photon) entanglement fidelity of $52.7\pm 11.4\%$. Our results close the performance gap between short-wavelength quantum dot systems and the existing telecom infrastructure, establishing a route towards practical large photonic cluster states for fibre-based quantum network applications.

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