Microwave quantum memories using solid state spins

使用固态自旋的微波量子存储器

• 批准号: 2361907
• 金额: --
• 依托单位: University College London
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2021
• 资助国家: 英国
• 起止时间: 2021 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2361907
• 关键词: Microwave; quantum; memories; using; solid

Hybrid quantum systems offer the exciting potential to connect different types of quantum system together to exploit their respective strengths. Superconducting qubits are well suited for performing quantum logic gates but have coherence times typically in the tens of us, while electron spins of donors in silicon have coherence times to 3 seconds, and their states can be stored and retrieved using coupled nuclear spins, offering coherence times of up to 3 hours. We have shown with collaborators in CEA Saclay that spins in silicon can be coupled to high Q factor superconducting cavities to yield Purcell enhanced relaxation of electron spins i.e. electron spins return to the ground state by emitting a microwave photon into the cavity. This lays the foundation for coherent magnetic coupling of individual spins to microwave photons and for interfacing superconducting qubits and spin memories using a superconducting resonator as a quantum bus. Such quantum memories could make use of dopant spins in silicon, or rare earth defects in solids. We have also demonstrated a multimode quantum memory protocol where multiple microwave qubit states can be stored and retrieved independently in an ensemble. This aim of this project is to use highly coherent spins in solid state material to store microwave photon states, as a resource for quantum information technologies. Such a quantum memory would be able to store and retrieve many such states with high fidelity, over times approaching seconds, and interface with one or more superconducting qubits.The research methodology, including new knowledge or techniques in engineering and physical sciences that will be investigated. The project methodology includes superconducting resonator design, modelling and nano micro fabrication, along with the investigation of novel spin systems and material hosts. Electron spin resonance will be used to study the spin coherence and line width properties, while implantation and annealing processes will be optimised to improve spin performance. A dilution refrigerator will be used to achieve high spin polarisation and ensure optimal operation of the superconducting qubits.The project is strongly aligned with EPSRCs Quantum Technologies programme, as well as the Quantum Computing and Simulation Hub. The project will benefit from ongoing academic collaborations with the group of Patrice Bertet CEA Saclay and Philippe Goldner Chemie ParisTech.

混合量子系统为将不同类型的量子系统连接在一起以利用其各自的优势提供了令人兴奋的潜力。超导码头非常适合执行量子逻辑门，但通常在我们的数十个中具有连贯的时间，而硅中的捐赠者的电子旋转具有连贯的时间至3秒钟，并且可以使用耦合的核旋转来存储并检索其状态，从而提供最多3个小时的连贯时间。我们已经与CEA Saclay的合作者一起表明，硅中的旋转可以与高Q因子超导腔耦合，从而产生purcell通过将微波光子发射到腔内的电子旋转，即电子旋转的弛豫，即电子旋转返回基态。这为单个自旋与微波光子的相干磁耦合以及使用超导谐振器作为量子总线的旋转记忆的基础奠定了基础。这种量子记忆可以利用硅中的掺杂剂旋转，或固体中的稀土缺陷。我们还展示了一种多模量子存储协议，其中可以在集合中独立存储和检索多个微波Qubit状态。该项目的目的是使用固态材料中的高度连贯的旋转来存储微波光子状态，作为量子信息技术的资源。这样的量子记忆将能够以高忠诚度，几秒钟的时间以及与一个或多个超导码头的接触。研究方法，包括将要研究的工程和物理科学领域的新知识或技术。该项目方法包括超导谐振器设计，建模和纳米微制造，以及对新型自旋系统和材料宿主的研究。电子自旋共振将用于研究自旋相干性和线宽性能，而植入和退火过程将被优化以提高自旋性能。稀释冰箱将用于实现高自旋极化并确保超导量子位的最佳操作。该项目与EPSRCS量子技术程序以及量子计算和仿真中心密切相同。该项目将受益于与Patrice Bertet CEA Saclay和Philippe Goldner Chemie Paristech的持续学术合作。