QC:SCALE - Quantum Circuits: Systematically Controlling And Linking Emitters for integrated solid state photonics platforms

QC:SCALE - 量子电路：系统地控制和链接集成固态光子平台的发射器

• 批准号: EP/W006685/1
• 负责人: Krishna Coimbatore Balram
• 金额: $ 109.27万
• 依托单位: University of Bristol
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2022
• 资助国家: 英国
• 起止时间: 2022 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=EP%2FW006685%2F1
• 关键词: QC; SCALE; Quantum; Circuits; Systematically

This project investigates a promising solid state architecture that could be extended to build a quantum information processor. We focus on a well understood system, the NV-defect centre in diamond. This centre has a ground state spin that is well coupled to photons such that arrays of spins coupled by low loss waveguides can be envisaged. However the solid state brings increased decoherence and spectral non-uniformity compared to atomic systems. It also brings the prospect of building spin and photonic interfaces at scale, using nanofabrication. Here we aim to individually address solid-state emitters control their spin and make them spectrally indistinguishable thus ensuring high fidelity spin quantum bits linked by waveguides on a chip. While most of the focus of the solid-state quantum photonics community has been devoted to finding an ideal solid-state emitter that exhibits atom-like properties, relatively little effort has been spent on figuring out how one can build complex opto-electronic systems around them enabling precise optical and spin control. This is especially important, given that traditional top-down semiconductor manufacturing methods cannot be directly applied to such bottom-up systems. Since a fully error corrected quantum computer will need O(1E6) qubits and even near-term noisy intermediate scale quantum (NISQ) devices need O(1E2) to demonstrate computational quantum supremacy, there is an urgent need to establish that bottom up systems employing solid state emitters can be scaled up to be competitive with top-down fabricated systems (such as those employed for linear optics and superconducting circuits). The NV- centre provides a room-temperature quantum system with optical and spin degrees of freedom that can be accessed and manipulated and this room temperature readout makes the NV- centre attractive for rapid iteration and prototyping of devices, both in the electrical and optical domain. In addition, the ready availability of high coherence NV- centres in nanodiamond form allows us to directly implement bottom-up manufacturing methods, originally developed in the bio-chemistry domain, such as precision localisation and templated self-assembly to solid state quantum optics.

该项目研究了一种有前景的固态架构，可以扩展该架构来构建量子信息处理器。我们专注于一个众所周知的系统，即钻石中的 NV 缺陷中心。该中心具有与光子良好耦合的基态自旋，使得可以设想通过低损耗波导耦合的自旋阵列。然而，与原子系统相比，固态会增加退相干性和光谱不均匀性。它还带来了利用纳米加工大规模构建自旋和光子界面的前景。在这里，我们的目标是单独解决固态发射器控制其自旋并使它们在光谱上无法区分，从而确保通过芯片上的波导连接的高保真自旋量子位。虽然固态量子光子学界的大部分注意力都致力于寻找一种具有类原子特性的理想固态发射器，但在弄清楚如何围绕其构建复杂的光电系统方面投入的精力相对较少。它们能够实现精确的光学和旋转控制。鉴于传统的自上而下的半导体制造方法不能直接应用于这种自下而上的系统，这一点尤其重要。由于完全纠错的量子计算机将需要 O(1E6) 个量子位，甚至近期噪声中尺度量子 (NISQ) 设备也需要 O(1E2) 来证明计算量子霸权，因此迫切需要建立采用自下而上的系统固态发射器可以按比例放大，以与自上而下制造的系统（例如用于线性光学和超导电路的系统）竞争。 NV-中心提供了具有可访问和操纵的光学和自旋自由度的室温量子系统，并且这种室温读数使NV-中心对于电学和光学领域的设备的快速迭代和原型设计具有吸引力。此外，纳米金刚石形式的高相干性NV中心的现成使我们能够直接实施最初在生物化学领域开发的自下而上的制造方法，例如精确定位和固态量子光学的模板化自组装。

项目成果

Robotic Vectorial Field Alignment for Spin-Based Quantum Sensors.

基于自旋的量子传感器的机器人矢量场对准。

• DOI: http://dx.10.1002/advs.202304449
• 发表时间: 2023
• 期刊: Advanced science (Weinheim, Baden-Wurttemberg, Germany)
• 作者: Smith JA

Heterogeneous Integration of Solid-State Quantum Systems with a Foundry Photonics Platform

固态量子系统与铸造光子学平台的异构集成

• DOI: 10.1021/acsphotonics.3c00713
• 发表时间: 2023-09-20
• 期刊: ACS Photonics
• 影响因子: 7
• 作者: Weng, Hao-Cheng;Monroy-Ruz, Jorge;Matthews, Jonathan C. F.;Rarity, John G.;Balram, Krishna C.;Smith, Joe A.
• 通讯作者: Smith, Joe A.