Modified coherence of quantum spins in a damped pure-dephasing model

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Abstract

We consider a spin-j particle coupled to a structured bath of bosonic modes that decay into thermal baths. We obtain an analytic expression for the reduced spin state and use it to investigate non-Markovian spin dynamics. In the heavily overdamped regime, spin coherences are preserved due to a quantum Zeno affect. We extend the solution to two spins and include coupling between the modes, which can be leveraged for preservation of the symmetric spin subspace. For many spins, we find that intermode coupling gives rise to a privileged symmetric mode gapped from the other modes. This provides a handle to selectively address that privileged mode for quantum control of the collective spin. Finally, we show that our solution applies to defects in solid-state systems, such as negatively charged nitrogen vacancy centers in diamond.

Original languageEnglish
Article number094308
Pages (from-to)094308-1- 094308-15
Number of pages15
JournalPhysical Review B: covering condensed matter and materials physics
Volume105
Issue number9
DOIs
Publication statusPublished - 1 Mar 2022

Bibliographical note

Copyright 2022 American Physical Society. Firstly published in Physical Review B, 105(9), 094308. The original publication is available at https://doi.org/10.1103/PhysRevB.105.094308. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.

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