Quantum magnomechanical thermometry

量子磁力机械测温

• 批准号: 568609-2021
• 负责人: Davis, John
• 金额: $ 3.64万
• 依托单位: University of Alberta
• 依托单位国家: 加拿大
• 项目类别: Alliance Grants
• 财政年份: 2021
• 资助国家: 加拿大
• 起止时间: 2021-01-01 至 2022-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=722625
• 关键词: Quantum; magnomechanical; thermometry

The measurement of temperature is fundamental to many aspects of science. There are two types of thermometers, so-called "primary" and "secondary" thermometers. Primary thermometers are based on fundamental physics that can be reproduced in any lab outfitted with the right equipment. Secondary thermometers, on the other hand, must be calibrated against a primary thermometer and can change depending on how they are measured. It is clearly advantageous to use primary thermometers, but in practice they are almost never used because they are expensive and difficult to implement. A simple, inexpensive primary thermometer would be a valuable addition to the market. With the growing importance of quantum technologies, which necessarily operate at extremely low temperatures, the demand for thermometers for use at cryogenic temperatures is growing. And while cryogenic refrigeration technologies are advancing, these thermometers are not. In fact, secondary thermometers for low temperatures are getting more expensive, as companies recognize that the growing demand means they can charge higher prices for calibrated secondary thermometers. Therefore, a market exists for useful primary thermometers at low temperatures (< 1 K). In this project, we will research a type of primary thermometer for low temperatures based on the thermal noise of a mechanical object, self-calibrating based on quantum shot noise. In particular, this will be based on a microwave measurement of mechanics, making it well suited to the cryogenic environment. This will build upon foundational work including a theoretical proposal for this thermometer (Magnon-Phonon Quantum Correlation Thermometry, C.A. Potts... J.P. Davis, Phys Rev Applied 13, 064001 2020) and our recent observations of mechanics in this system (Dynamical Backaction Magnomechanics, C.A. Potts... J.P. Davis, Phys Rev X 11, 031053 2021).

温度测量是科学许多方面的基础。 温度计有两种类型，即所谓的“主”温度计和“辅助”温度计。 初级温度计基于基础物理学，可以在任何配备合适设备的实验室中复制。 另一方面，辅助温度计必须根据主温度计进行校准，并且可能会根据测量方式而变化。 使用初级温度计显然是有利的，但实际上它们几乎从未使用过，因为它们昂贵且难以实施。 简单、廉价的初级温度计将成为市场的一个有价值的补充。 随着量子技术的重要性日益增加，量子技术必须在极低的温度下运行，对低温下使用的温度计的需求也在不断增长。 尽管低温制冷技术不断进步，但这些温度计却没有进步。 事实上，用于低温的辅助温度计变得越来越昂贵，因为公司认识到不断增长的需求意味着他们可以对校准的辅助温度计收取更高的价格。 因此，存在有用的低温（< 1 K）初级温度计市场。 在这个项目中，我们将研究一种基于机械物体热噪声的低温初级温度计，基于量子散粒噪声进行自校准。 特别是，这将基于微波力学测量，使其非常适合低温环境。 这将建立在基础工作的基础上，包括该温度计的理论建议（Magnon-Phonon Quantum Correlation Thermometry，C.A. Potts...J.P. Davis，Phys Rev Applied 13, 064001 2020）以及我们最近对该系统中力学的观察（动态反作用磁力力学） ，C.A. 波茨...J.P. 戴维斯，物理 Rev X 11, 031053 2021）。