Protecting a Diamond Quantum Memory by Charge State Control,Nano Letters

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Protecting a Diamond Quantum Memory by Charge State Control
Nano Letters ( IF 9.6 ) Pub Date : 2017-09-11 00:00:00 , DOI: 10.1021/acs.nanolett.7b01796
Matthias Pfender ₁ , Nabeel Aslam ₁ , Patrick Simon ₂ , Denis Antonov ₁ , Gergő Thiering _{3,

4} , Sina Burk ₁ , Felipe Fávaro de Oliveira ₁ , Andrej Denisenko ₁ , Helmut Fedder _{1,

5} , Jan Meijer ₆ , Jose A. Garrido _{2,

7,

8} , Adam Gali _{3,

4} , Tokuyuki Teraji ₉ , Junichi Isoya ₁₀ , Marcus William Doherty ₁₁ , Audrius Alkauskas ₁₂ , Alejandro Gallo ₁₃ , Andreas Grüneis ₁₃ , Philipp Neumann ₁ , Jörg Wrachtrup _{1,

13}

Affiliation

Stuttgart Research Center of Photonic Engineering (SCoPE) and Center for Integrated Quantum Science and Technology (IQST), Third Institute of Physics, University of Stuttgart, 70569 Stuttgart, Germany
Walter Schottky Institut, Physik-Department, Technische Universität München, Am Coulombwall 3, 85748 Garching, Germany
Institute for Solid State Physics and Optics, Wigner Research Centre for Physics, Hungarian Academy of Sciences, P.O. Box 49, H-1525 Budapest, Hungary
Department of Atomic Physics, Budapest University of Technology and Economics, Budafoki út 8, H-1111 Budapest, Hungary
Swabian Instruments GmbH, Frankenstr. 39, 71701 Schwieberdingen, Germany
Institute for Experimental Physics II, Universität Leipzig, Linnéstraße 5, 04103 Leipzig, Germany
Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and the Barcelona Institute of Science and Technology, Campus UAB, Bellaterra, 08193 Barcelona, Spain
ICREA, Pg. Lluís Companys 23, 08010 Barcelona, Spain
National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
Research Center for Knowledge Communities, University of Tsukuba, Tsukuba 305-8550, Japan
Laser Physics Centre, Research School of Physics and Engineering, Australian National University, Australian Capital Territory 2601, Australia
Center for Physical Sciences and Technology, Vilnius LT-10257, Lithuania
Max Planck Institute for Solid State Research, Heisenbergstraße 1, 70569 Stuttgart, Germany

In recent years, solid-state spin systems have emerged as promising candidates for quantum information processing. Prominent examples are the nitrogen-vacancy (NV) center in diamond, phosphorus dopants in silicon (Si:P), rare-earth ions in solids, and V_Si-centers in silicon-carbide. The Si:P system has demonstrated that its nuclear spins can yield exceedingly long spin coherence times by eliminating the electron spin of the dopant. For NV centers, however, a proper charge state for storage of nuclear spin qubit coherence has not been identified yet. Here, we identify and characterize the positively charged NV center as an electron-spin-less and optically inactive state by utilizing the nuclear spin qubit as a probe. We control the electronic charge and spin utilizing nanometer scale gate electrodes. We achieve a lengthening of the nuclear spin coherence times by a factor of 4. Surprisingly, the new charge state allows switching of the optical response of single nodes facilitating full individual addressability.

中文翻译：

通过电荷状态控制保护钻石量子存储器

近年来，固态自旋系统已经成为量子信息处理的有前途的候选者。突出的例子是金刚石中的氮空位（NV）中心，硅中的磷掺杂剂（Si：P），固体中的稀土离子和V _Si-以碳化硅为中心。Si：P系统已证明，通过消除掺杂剂的电子自旋，其核自旋可产生超长的自旋相干时间。但是，对于NV中心，尚未确定用于存储核自旋量子位相干性的适当电荷状态。在这里，我们通过利用核自旋量子位作为探针，将带正电荷的NV中心识别并表征为无电子自旋和光学惰性的状态。我们控制电荷并利用纳米级栅电极自旋。我们将核自旋相干时间延长了4倍。令人惊讶的是，新的电荷状态允许切换单个节点的光学响应，从而促进了完整的个人寻址能力。

更新日期：2017-09-11

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