Enhancing Spin Coherence in Optically Addressable Molecular Qubits through Host-Matrix Control

• URL: http://arxiv.org/abs/2204.00168v1
• Date: Fri, 1 Apr 2022 02:30:18 GMT
• Title: Enhancing Spin Coherence in Optically Addressable Molecular Qubits through Host-Matrix Control
• Authors: S. L. Bayliss, P. Deb, D. W. Laorenza, M. Onizhuk, G. Galli, D. E. Freedman, D. D. Awschalom
• Abstract summary: Optically addressable spins are a promising platform for quantum information science. We show how the spin coherence in such optically addressable molecular qubits can be controlled through engineering their host environment. Our results demonstrate the ability to test qubit structure-function relationships through a tunable molecular platform.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Optically addressable spins are a promising platform for quantum information science due to their combination of a long-lived qubit with a spin-optical interface for external qubit control and read out. The ability to chemically synthesize such systems - to generate optically addressable molecular spins - offers a modular qubit architecture which can be transported across different environments, and atomistically tailored for targeted applications through bottom-up design and synthesis. Here we demonstrate how the spin coherence in such optically addressable molecular qubits can be controlled through engineering their host environment. By inserting chromium (IV)-based molecular qubits into a non-isostructural host matrix, we generate noise-insensitive clock transitions, through a transverse zero-field splitting, that are not present when using an isostructural host. This host-matrix engineering leads to spin-coherence times of more than 10 microseconds for optically addressable molecular spin qubits in a nuclear and electron-spin rich environment. We model the dependence of spin coherence on transverse zero-field splitting from first principles and experimentally verify the theoretical predictions with four distinct molecular systems. Finally, we explore how to further enhance optical-spin interfaces in molecular qubits by investigating the key parameters of optical linewidth and spin-lattice relaxation time. Our results demonstrate the ability to test qubit structure-function relationships through a tunable molecular platform and highlight opportunities for using molecular qubits for nanoscale quantum sensing in noisy environments.

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