Zhang Xufeng, Zou Chang-Ling, Zhu Na, Marquardt Florian, Jiang Liang, Tang Hong X
Department of Electrical Engineering, Yale University, New Haven, Connecticut 06511, USA.
Department of Applied Physics, Yale University, New Haven, Connecticut 06511, USA.
Nat Commun. 2015 Nov 16;6:8914. doi: 10.1038/ncomms9914.
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.
人们已经付出了巨大努力来开发混合量子系统，通过引入具有天然长寿命的自旋自由度来克服超导电路相干时间短的问题。在所有可能的材料中，单晶钇铁石榴石最近已成为混合系统的一个有前途的候选材料，并且已经证明了各种高度相干的相互作用，包括强耦合甚至超强耦合。这些系统的一个显著优点是自旋形成了明确的磁振子模式，这允许进行灵活而精确的调谐。在这里，我们证明通过耗散工程，可以实现磁振子与微波腔光子之间的非马尔可夫相互作用动力学。这样的过程使我们能够构建一个磁振子梯度存储器，将信息存储在与微波腔解耦从而具有长寿命的磁振子暗模式中。我们的发现为开发长寿命、多模量子存储器提供了一种有前途的方法。
