Diamond optomechanical crystals with embedded nitrogen-vacancy centers
Diamond optomechanical crystals with embedded nitrogen-vacancy centers
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DOI：
10.1088/2058-9565/ab043e
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发表时间：
2019-04-01
影响因子：
6.7
通讯作者：
Jayich, Ania C. Bleszynski
中科院分区：
文献类型：
--
作者：
Cady, Jeffrey, V;Michel, Ohad;Jayich, Ania C. Bleszynski
混合量子器件将不同的量子元素组合在一起以实现增强的功能，由于它们在解决量子信息处理、通信和控制方面的关键问题方面具有激动人心的潜力，近年来受到了极大的关注。具体地说，在混合机械器件领域已经取得了重大进展，其中一个量子比特耦合到一个机械振荡器。超导量子比特已经证明了这种器件的高协作性，并且通过晶体应变将缺陷量子比特耦合到机械元件，使得量子比特测量和控制的新方法成为可能。在本文中，我们展示了具有嵌入氮-空位(NV)中心的金刚石光机械晶体(OMC)的制备，这是利用缺陷量子比特混合机械器件达到量子区域的初步步骤。我们测量了钻石OMC的光学和机械共振以及单个嵌入的NV中心的自旋相干性。我们发现，尽管自旋接近纳米级表面，但它具有较长的相干时间T-2*=1.5mU S和T-2=72mU S。最后，我们讨论了这些器件的潜在改进和对未来量子领域实验的展望。
Hybrid quantum devices, in which disparate quantum elements are combined in order to achieve enhanced functionality, have received much attention in recent years due to their exciting potential to address key problems in quantum information processing, communication, and control. Specifically, significant progress has been made in the field of hybrid mechanical devices, in which a qubit is coupled to a mechanical oscillator. High cooperativity in such devices has been demonstrated with superconducting qubits, and coupling defect qubits to mechanical elements via crystal strain has enabled novel methods of qubit measurement and control. In this paper we demonstrate the fabrication of diamond optomechanical crystals (OMCs) with embedded nitrogen-vacancy (NV) centers, a preliminary step toward reaching the quantum regime with defect qubit hybrid mechanical devices. We measure optical and mechanical resonances of diamond OMCs as well as the spin coherence of single embedded NV centers. We find that the spin has long coherence times T-2* = 1.5 mu s and T-2 = 72 mu s despite its proximity to nanofabricated surfaces. Finally, we discuss potential improvements of these devices and prospects for future experiments in the quantum regime.