题目：Portable diamond maser for quantum sensing with low noise temperatures, without cryogenics

报告人：Dr. Wern Ng

时 间：2024年9月23日（周一） 14:00-15:15

地 点：中关村校区，体育馆南厅A03-A04会议室

摘要：Masers, the microwave analogue of the laser, can amplify the weakest electrical signals for medical diagnostics and mobile communications. However, to this day the only room temperature CW maser made from NV- diamond is trapped by needing >2000kg electromagnets, being unfeasible to carry between labs and users. We present a breakthrough portable CW maser, reduced to just 30 kg and easily carried between benchtops. The maser power exceeds that of the first diamond maser iteration, and we benchmark the performance under non-ideal magnetic field alignment of the NV- spins. The results show robust maser performance against large angle misalignment to the DC magnetic field, while preserving high masing amplitudes at the same microwave frequency.
This lays the foundations for reducing the footprint of room temperature masers further, opening opportunities for other research groups and industries to use the maser’s exquisite low-noise capabilities in mobile communication and the growing quantum computing field, which relies on faint microwave signals for qubit readout.

微波激射，既微波频段的激光，可作为超低噪声微波放大器增强极微弱微波信号，用于医疗检测和移动通讯领域。但直到现在，唯一的常温连续波微波激射器（基于金刚石NV-色心）需要>2000kg电磁铁，对运输、使用造成了不便。在本报告中，我们将介绍常温连续波微波激射器的重要进展——我们把器件重量减少到30kg，并且相比于现有金刚石NV-微波激射器功率增强。此外，我们也将展示外加磁场与NV-晶轴对齐程度不会对微波激射器性能造成太大影响。我们的研究将为常温微波激射器轻量化、小型化提供新的思路，也将促进该类器件更快速的扩展和推广，使其低噪声放大潜力在移动通讯和量子计算等领域得以实现。

简历：Wern Ng comes from Malaysia and is a Postdoc at Imperial College London (ICL), having finished his PhD in Materials there. His thesis was on building homemade transient EPR spectrometers with second-hand parts, to study maser materials and long-lifetime spin materials such as pentacene and NV- diamond. He has published four papers in journals such as Advanced Materials (IF 27.4) and Applied Physics Letters. He has secured multiple grants such as the Innovation Fund (£10k), Royce Industrial Programme (£100k) and EPSRC Maser-in-a-Shoebox grant (£475k, EP/Y00471X/1). In his free time, he is currently a slow-learning beginner at guitar.

联系方式：hao.wu@bit.edu.cn

邀请人： 吴昊

网 址：/

承办单位：物理学院、量子技术研究中心