Magnon dark modes and gradient memory

Xufeng Zhang, Chang-Ling Zou, Na Zhu, Florian Marquardt, Liang Jiang and Hong X. Tang ()
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Xufeng Zhang: Yale University
Chang-Ling Zou: Yale University
Na Zhu: Yale University
Florian Marquardt: Institute for Theoretical Physics II, University of Erlangen-Nuremberg
Liang Jiang: Yale University
Hong X. Tang: Yale University

Nature Communications, 2015, vol. 6, issue 1, 1-7

Abstract: Abstract Extensive efforts have been expended in developing hybrid quantum systems to overcome the short coherence time of superconducting circuits by introducing the naturally long-lived spin degree of freedom. Among all the possible materials, single-crystal yttrium iron garnet has shown up recently as a promising candidate for hybrid systems, and various highly coherent interactions, including strong and even ultrastrong coupling, have been demonstrated. One distinct advantage in these systems is that spins form well-defined magnon modes, which allows flexible and precise tuning. Here we demonstrate that by dissipation engineering, a non-Markovian interaction dynamics between the magnon and the microwave cavity photon can be achieved. Such a process enables us to build a magnon gradient memory to store information in the magnon dark modes, which decouple from the microwave cavity and thus preserve a long lifetime. Our findings provide a promising approach for developing long-lifetime, multimode quantum memories.

Date: 2015
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DOI: 10.1038/ncomms9914

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