Scalable diamond quantum systems

钻石中的色心是赋予这种无色晶体颜色的杂质。除了珠宝之外，它们还具有重要的科学意义，并已成为实施量子网络，传感器和计算机等量子技术的有前途的平台。我们建议进一步研究和开发金刚石中的锡空位（SnV）色心，因为它在更友好的温度下工作（不需要稀释冰箱），光子发射效率高，并且能够充当量子存储器和存储量子信息，因此特别有前景。然而，对于所有这些应用来说，在光子结构中嵌入单个或多个色中心是至关重要的，以便实现与色中心的接口而不降低它们的性能。我们建议在这个项目的过程中做到这一点，并通过特殊工程的钻石结构，新材料加工和新的设计技术来推动这种量子光子界面和色心与光之间相互作用的极限。在这个项目的过程中，我们将展示一个或几个色心量子比特与光学谐振器的相互作用，这是许多量子技术的关键要素。拟议的研究将影响量子工程、基础物理和材料科学。该项目包括教育和外联活动，其中包括PI已经发起的与研究相结合的活动，包括积极征聘少数民族和妇女从事科学和工程职业，以及本科生研究和咨询。我们提出了一个为期3年的努力，重点开发光学可访问的自旋量子比特，具有长相干时间，高操作保真度，远距离相互作用的有效光物质界面，以及高温操作的潜力（几个开尔文，消除了对稀释冰箱的需要）。我们将基于金刚石光子谐振器中的锡空位（SnV）中心来开发该系统。具体的研究目标是：●在金刚石衬底上研究新的纳米制造方法，使单个SnV和多个SnV色中心与腔体实现可控的强耦合。●演示和研究SnV发射器和金刚石腔之间的单发射极和多发射极腔QED。光-物质相互作用的强耦合机制的演示对于许多量子技术至关重要，并且可以用作量子网络节点，量子传感器以及可扩展的光子或基于自旋的量子计算的构建块。该奖项反映了美国国家科学基金会的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。

Color centers in diamond are impurities which give color to this otherwise colorless crystal. In addition to jewelry, they are also of scientific importance and have emerged as a promising platform for implementing quantum technologies such as quantum networks, sensors, and computers. We propose to further investigate and develop the tin-vacancy (SnV) color center in diamond, which is particularly promising because of its operation at friendlier temperatures (not requiring dilution refrigerators), high efficiency of photon emission, and ability to act as quantum memory and store quantum information. However, for all of these applications it is critical to embed either individual or several color centers inside of photonic structures, in order to implement interfaces to color centers without degrading them. We propose to do this over the course of this project, and to push the limits of such quantum photonic interfaces and interaction between color centers and light with specially engineered diamond structures, new materials processing, and new design techniques. We will demonstrate the interaction of one or a few color center qubits with an optical resonator over the course of this project, which is a key element of many quantum technologies. The proposed research will impact quantum engineering, fundamental physics, and materials science. The project includes educational and outreach activities integrated with research, which the PI has already initiated, including active recruitment of minorities and women for science and engineering careers, and undergraduate research and advising. Technical description We propose a 3-year effort focused on developing optically accessible spin qubits with long coherence time, high operation fidelity, efficient light-matter interfaces for long-range interactions, and the potential for high-temperature operation (a few Kelvin, eliminating the need for a dilution refrigerator). We will develop this system based on tin-vacancy (SnV) centers in diamond photonic resonators. The specific research goals are: ● To investigate novel nano-fabrication methods on diamond substrates that enable controllable, strong coupling of a single SnV and several SnV color centers to the cavity.● To demonstrate and to investigate single and multi-emitter cavity QED between SnV emitters and a diamond cavity. The demonstration of the strong coupling regime of light-matter interaction is crucial for numerous quantum technologies, and can be used as a building block for quantum network nodes, quantum sensors, and for scalable photonic or spin based quantum computing.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.