Geometric spin echo under zero field

Yuhei Sekiguchi, Yusuke Komura, Shota Mishima, Touta Tanaka, Naeko Niikura and Hideo Kosaka ()
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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

Nature Communications, 2016, vol. 7, issue 1, 1-6

Abstract: 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.

Date: 2016
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DOI: 10.1038/ncomms11668

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