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Geometric spin echo under zero field

Author

Listed:
  • Yuhei Sekiguchi

    (Electrical and Computer Engineering, Graduate School of Engineering, Yokohama National University, 79-5 Tokiwadai)

  • Yusuke Komura

    (Electrical and Computer Engineering, Graduate School of Engineering, Yokohama National University, 79-5 Tokiwadai)

  • Shota Mishima

    (Electrical and Computer Engineering, Graduate School of Engineering, Yokohama National University, 79-5 Tokiwadai)

  • Touta Tanaka

    (Electrical and Computer Engineering, Graduate School of Engineering, Yokohama National University, 79-5 Tokiwadai)

  • Naeko Niikura

    (Electrical and Computer Engineering, Graduate School of Engineering, Yokohama National University, 79-5 Tokiwadai)

  • Hideo Kosaka

    (Electrical and Computer Engineering, Graduate School of Engineering, Yokohama National University, 79-5 Tokiwadai)

Abstract

Spin echo is a fundamental tool for quantum registers and biomedical imaging. It is believed that a strong magnetic field is needed for the spin echo to provide long memory and high resolution, since a degenerate spin cannot be controlled or addressed under a zero magnetic field. While a degenerate spin is never subject to dynamic control, it is still subject to geometric control. Here we show the spin echo of a degenerate spin subsystem, which is geometrically controlled via a mediating state split by the crystal field, in a nitrogen vacancy centre in diamond. The demonstration reveals that the degenerate spin is protected by inherent symmetry breaking called zero-field splitting. The geometric spin echo under zero field provides an ideal way to maintain the coherence without any dynamics, thus opening the way to pseudo-static quantum random access memory and non-invasive biosensors.

Suggested Citation

  • Yuhei Sekiguchi & Yusuke Komura & Shota Mishima & Touta Tanaka & Naeko Niikura & Hideo Kosaka, 2016. "Geometric spin echo under zero field," Nature Communications, Nature, vol. 7(1), pages 1-6, September.
    • Handle: RePEc:nat:natcom:v:7:y:2016:i:1:d:10.1038_ncomms11668
    DOI: 10.1038/ncomms11668
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