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Localization and topology protected quantum coherence at the edge of hot matter

Author

Listed:
  • Yasaman Bahri

    (University of California)

  • Ronen Vosk

    (Weizmann Institute of Science)

  • Ehud Altman

    (University of California
    Weizmann Institute of Science)

  • Ashvin Vishwanath

    (University of California)

Abstract

Topological phases are characterized by edge states confined near the boundaries by a bulk energy gap. On raising temperature, these edge states are typically lost due to mobile thermal excitations. However, disorder can localize an isolated many-body system, potentially allowing for a sharply defined topological phase even in a highly excited state. We explicitly demonstrate this in a model of a disordered, one-dimensional magnet with spin one-half edge excitations. Furthermore, we show that the time evolution of a simple, highly excited state reveals quantum coherent edge spins. In particular, we demonstrate the coherent revival of an edge spin over a time scale that grows exponentially with system size. This is in sharp contrast to the general expectation that quantum bits strongly coupled with a hot many-body system will rapidly lose coherence. This result opens new directions in the study of topologically protected quantum dynamics.

Suggested Citation

  • Yasaman Bahri & Ronen Vosk & Ehud Altman & Ashvin Vishwanath, 2015. "Localization and topology protected quantum coherence at the edge of hot matter," Nature Communications, Nature, vol. 6(1), pages 1-6, November.
    • Handle: RePEc:nat:natcom:v:6:y:2015:i:1:d:10.1038_ncomms8341
    DOI: 10.1038/ncomms8341
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    Cited by:

    1. Liang Xiang & Wenjie Jiang & Zehang Bao & Zixuan Song & Shibo Xu & Ke Wang & Jiachen Chen & Feitong Jin & Xuhao Zhu & Zitian Zhu & Fanhao Shen & Ning Wang & Chuanyu Zhang & Yaozu Wu & Yiren Zou & Jiar, 2024. "Long-lived topological time-crystalline order on a quantum processor," Nature Communications, Nature, vol. 15(1), pages 1-9, December.

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