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arXiv · 2505.17195

A high-resolution molecular spin-photon interface at telecommunications wavelengths

Leah R. Weiss·Grant T. Smith·Ryan A. Murphy·Bahman Golesorkhi·José A. Méndez Méndez·Priya Patel·Jens Niklas·Oleg G. Poluektov·Jeffrey R. Long·David D. Awschalom
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Abstract

Optically addressable electronic spins in polyatomic molecules are a promising platform for quantum information science with the potential to enable scalable qubit design and integration through atomistic tunability and nanoscale localization. However, optical state- and site-selection are an open challenge. Here we introduce an organo-erbium spin qubit in which narrow (MHz-scale) optical and spin transitions couple to provide high-resolution access to spin degrees of freedom with telecommunications frequency light. This spin-photon interface enables demonstration of optical spin polarization and readout that distinguishes between spin states and magnetically inequivalent sites in a molecular crystal. Operation at frequencies compatible with mature photonic and microwave devices opens a path for engineering scalable, integrated molecular spin-optical quantum technologies.

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Leah R. Weiss, Grant T. Smith, Ryan A. Murphy, Bahman Golesorkhi, José A. Méndez Méndez, Priya Patel, Jens Niklas, Oleg G. Poluektov, Jeffrey R. Long, David D. Awschalom. 2025-05-22. A high-resolution molecular spin-photon interface at telecommunications wavelengths. https://arxiv.org/abs/2505.17195

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