Decoherence in exchange-coupled quantum spin-qubit systems: Impact of multiqubit interactions and geometric connectivity

Quan Fu; Jiahao Wu; Xin Wang

doi:10.1103/PhysRevA.109.052628

Decoherence in exchange-coupled quantum spin-qubit systems: Impact of multiqubit interactions and geometric connectivity

Quan Fu, Jiahao Wu, Xin Wang^*

^*Corresponding author for this work

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

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Abstract

We investigate the impact of different connectivities on the decoherence time in quantum systems under quasistatic Heisenberg noise. We considered three types of elementary units, including node, stick and triangle and connect them into ring, chain, and tree configurations. We find that rings exhibit greater stability compared with chains, contrary to the expectation that higher average connectivity leads to decreased stability. Additionally, the stick configuration is more stable than the triangle configuration. We also observe similar trends in entanglement entropy and return probability, indicating their potential use in characterizing decoherence time. Our findings provide insights into the interplay between connectivity and stability in quantum systems, with implications for the design of robust quantum technologies and quantum error correction strategies.

© 2024 American Physical Society

Original language	English
Article number	052628
Journal	Physical Review A - Atomic, Molecular, and Optical Physics
Volume	109
Issue number	5
Online published	29 May 2024
DOIs	https://doi.org/10.1103/PhysRevA.109.052628
Publication status	Published - May 2024

Funding

This work is supported by the Key-Area Research and Development Program of GuangDong Province (Grant No. 2018B030326001) and the Research Grants Council of Hong Kong (Grant No. CityU 11304920).

Publisher's Copyright Statement

COPYRIGHT TERMS OF DEPOSITED FINAL PUBLISHED VERSION FILE: Fu, Q., Wu, J., & Wang, X. (2024). Decoherence in exchange-coupled quantum spin-qubit systems: Impact of multiqubit interactions and geometric connectivity. Physical Review A - Atomic, Molecular, and Optical Physics, 109(5), Article 052628. https://doi.org/10.1103/PhysRevA.109.052628 The copyright of this article is owned by American Physical Society.

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title = "Decoherence in exchange-coupled quantum spin-qubit systems: Impact of multiqubit interactions and geometric connectivity",

abstract = "We investigate the impact of different connectivities on the decoherence time in quantum systems under quasistatic Heisenberg noise. We considered three types of elementary units, including node, stick and triangle and connect them into ring, chain, and tree configurations. We find that rings exhibit greater stability compared with chains, contrary to the expectation that higher average connectivity leads to decreased stability. Additionally, the stick configuration is more stable than the triangle configuration. We also observe similar trends in entanglement entropy and return probability, indicating their potential use in characterizing decoherence time. Our findings provide insights into the interplay between connectivity and stability in quantum systems, with implications for the design of robust quantum technologies and quantum error correction strategies.{\textcopyright} 2024 American Physical Society",

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N2 - We investigate the impact of different connectivities on the decoherence time in quantum systems under quasistatic Heisenberg noise. We considered three types of elementary units, including node, stick and triangle and connect them into ring, chain, and tree configurations. We find that rings exhibit greater stability compared with chains, contrary to the expectation that higher average connectivity leads to decreased stability. Additionally, the stick configuration is more stable than the triangle configuration. We also observe similar trends in entanglement entropy and return probability, indicating their potential use in characterizing decoherence time. Our findings provide insights into the interplay between connectivity and stability in quantum systems, with implications for the design of robust quantum technologies and quantum error correction strategies.© 2024 American Physical Society

AB - We investigate the impact of different connectivities on the decoherence time in quantum systems under quasistatic Heisenberg noise. We considered three types of elementary units, including node, stick and triangle and connect them into ring, chain, and tree configurations. We find that rings exhibit greater stability compared with chains, contrary to the expectation that higher average connectivity leads to decreased stability. Additionally, the stick configuration is more stable than the triangle configuration. We also observe similar trends in entanglement entropy and return probability, indicating their potential use in characterizing decoherence time. Our findings provide insights into the interplay between connectivity and stability in quantum systems, with implications for the design of robust quantum technologies and quantum error correction strategies.© 2024 American Physical Society

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Decoherence in exchange-coupled quantum spin-qubit systems: Impact of multiqubit interactions and geometric connectivity

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Decoherence in exchange-coupled quantum spin-qubit systems: Impact of multiqubit interactions and geometric connectivity

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