Quantum magnomechanical thermometry

温度的测量是科学的许多方面的基础。有两种类型的温度计，即所谓的“初级”温度计和“次级”温度计。初级温度计是以基本物理为基础的，可以在任何配备适当设备的实验室中复制。另一方面，二次温度计必须对照一次温度计进行校准，并且可以根据其测量方式而改变。使用初级温度计显然是有利的，但实际上它们几乎从未被使用过，因为它们昂贵且难以实施。一种简单、廉价的初级温度计将是市场上有价值的补充。随着量子技术的重要性与日俱增，量子技术必然在极低的温度下工作，因此对低温下使用的温度计的需求也在不断增长。尽管低温制冷技术正在进步，但这些温度计却并非如此。事实上，随着公司意识到不断增长的需求意味着他们可以对校准的二次温度计收取更高的价格，用于低温的二次温度计正变得越来越贵。因此，在低温(&lt；1K)下存在有用的初级温度计的市场。在本项目中，我们将研究一种基于机械物体的热噪声、基于量子散粒噪声的自校准的低温一次温度计。特别是，这将基于微波力学测量，使其非常适合低温环境。这将建立在基础性工作的基础上，包括这种温度计的理论建议(磁振子量子关联测温，C.A.波茨...J.P.戴维斯，物理修订应用13,064001 2020年)和我们最近在这个系统中的力学观察(动力反作用力磁力学，C.A.波茨...J.P.Davis，Phys Revv X 11,031053 2021年)。

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).