Dopant-Based Scalable Platform in Silicon for Quantum Information Processing

用于量子信息处理的基于掺杂剂的可扩展硅平台

• 批准号: RGPIN-2020-05738
• 负责人: DupontFerrier, Eva
• 金额: $ 2.4万
• 依托单位: Université de Sherbrooke
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2020
• 资助国家: 加拿大
• 起止时间: 2020-01-01 至 2021-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=716166
• 关键词: Dopant; Based; Scalable; Platform; Silicon

Following the digital revolution, everyone is now massively using silicon transistors provided by microelectronics industry: They are the basic element not only of supercomputers, but of all electronic devices that have invaded every aspect of our modern lives (cell phones, PCs, GPS, cars, TV, internet router, ). This revolution of our modern society has brought increased comfort and allowed progress in science. Improvement of computer chips has been driven by reducing the size of the transistors, but this scaling has now reached a limit where both sensitivity to the exact position of single dopant atoms and quantum effects present major obstacles to further downscaling, calling for the exploration of highly innovative and disruptive approaches to further the development of computing in silicon. Several academic and major industrial players (as Intel) explore ultrascaled transistors at low temperature for quantum computation: The transistor channel then behaves as a quantum dot confining a single electron whose spin (instead of charge) is used to encode quantum information. Yet, the electron spin-coherence time is limited, allowing only for a very limited number of operations before the system decoheres, and the devices are still prone to dopant variability, preventing scalable architecture to emerge. In this discovery grant (DG) we instead consider nuclear spins of dopants, naturally present in transistors, to encode the quantum information. They have already demonstrated record coherence times, several orders of magnitude larger than the ones of electron spins in quantum dots. We will first address the key challenge for operating nuclear spin qubits: addressability. This DG will turn the strong sensitivity of ultrascaled transistor to individual dopants into an advantage. The small size of ultrascaled transistors will here be a key advantage by providing a means to focus electric and magnetic fields onto the well isolated nuclear spin. We will focus our research on dopants with high nuclear spin which provide the necessary redundancy to encode error-corrected logical qubits and allow for electrical manipulation of the spin, an essential asset to scalability. We will then develop coupling schemes between two nuclear spins located in distant transistors by using a lossless superconducting resonators, mediating the interaction between two nuclear spins via an electron spin. This DG will provide a way forward for the classical electronics industry by bringing it to use for future quantum computers. Our research will provide the building blocks of a quantum processor: Excellent quantum bits formed by the nuclear spin of a dopant located in the transistor channel. We expect our device to show unprecedented capabilities, such as built-in error correction, long coherence and scalability. This DG has the potential to provide Canada with disruptive devices for the microelectronic industry as well as a cutting edge in the race of quantum computation.

在数字革命之后，每个人现在都大量使用微电子行业提供的硅晶体管：它们不仅是超级计算机的基本要素，而且是所有已经入侵我们现代生活的各个方面的电子设备的基本要素（手机，PC，GPS，GPS，CARS，CARS，CARS ，电视，互联网路由器）。我们现代社会的这一革命给科学带来了增强的舒适感和进步。 计算机芯片的改进是通过减小晶体管的大小来驱动的，但是现在，这种缩放率已经达到了一个极限，在这种极限上，对单个掺杂剂原子的确切位置和量子效应的敏感性都带来了进一步降低降低的主要障碍，呼吁探索高度的探索。创新和破坏性的方法，以进一步开发硅的计算。几位学术和主要工业参与者（AS Intel）在低温下探索了超级晶体管以进行量子计算：然后，晶体管通道的行为是限制单个电子的量子点，其自旋（代替电荷）用于编码量子信息。然而，电子自旋连接时间受到限制，仅在系统破裂之前的操作数量非常有限，并且设备仍然容易出现掺杂剂的可变性，从而阻止了可扩展的体系结构的出现。 在这项发现赠款（DG）中，我们相反考虑了自然存在于晶体管中的掺杂剂的核自旋，以编码量子信息。他们已经证明了创纪录的相干时间，几个数量级比量子点中的电子旋转大。 我们将首先应对操作核旋转量子的主要挑战：可寻址性。该DG将将超晶体管对单个掺杂剂的强灵敏度转化为优势。通过提供一种将电场和磁场聚焦到隔离良好的核自旋上的手段，超大型晶体管的尺寸很小。 我们将把研究重点放在具有高核自旋的掺杂剂上，这些掺杂剂提供了必要的冗余，以编码错误校正的逻辑量子位，并允许对自旋的电气操纵，这是可伸缩性的必不可少的资产。 然后，我们将通过使用无损超导谐振器在位于遥远晶体管的两个核自旋之间开发耦合方案，从而通过电子自旋介导了两个核自旋之间的相互作用。 该DG将通过将其用于未来的量子计算机来为古典电子行业提供前进的道路。我们的研究将提供量子处理器的组成部分：由位于晶体管通道中的掺杂剂的核自旋形成的出色量子位。我们希望我们的设备能够显示出前所未有的功能，例如内置误差校正，长相干性和可扩展性。该DG有可能为加拿大提供微电子行业的破坏性设备，以及量子计算种族的最前沿。