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This research demonstrates a significant breakthrough in integrating chiral quantum light-matter interfaces with existing telecom infrastructure at 1260nm, enabling high-fidelity photon directionality for long-distance fiber optic networks. By leveraging intrinsic spin to dictate emission paths within indium phosphide microdisks, the team has created essential building blocks for deterministic quantum logical gates and entanglement generation protocols without requiring external non-reciprocal components. This advancement marks a pivotal step toward practical, scalable quantum photonic circuits compatible with current communication standards.

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Telecom Photons Controlled by Quantum Dot Chirality at 1260nm

Quantum ZeitgeistAugust 4, 20266 min read

Researchers created a chiral interface using InAs quantum dots and a microdisk, emitting directional light at 1260nm—critical for compatibility with existing telecom infrastructure.

Researchers at Queen’s University, Nanyang Technological University and the National Research Council of Canada have achieved directional control of photons at the 1260nm wavelength, a crucial band for long-distance fiber optic communication. The team fabricated an integrated platform consisting of indium phosphide microdisks alongside indium arsenide quantum dots with a density of 108 cm-2, demonstrating near-ideal chiral quantum coupling required for quantum information processing. They tuned the quantum dot transitions through the photonic cavity using a strong magnetic field, observing a peak cavity enhancement of 3.3 and an emission directionality of 0.985, meaning the spin of the quantum dot dictates the direction the photon is emitted. These “chiral quantum light–matter interfaces” are essential building blocks for…

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