Magnon-Phonon Quantum Correlation Thermometry
Abstract
A large fraction of quantum science and technology requires low-temperature environments such as those afforded by dilution refrigerators. In these cryogenic environments, accurate thermometry can be difficult to implement, expensive, and often requires calibration to an external reference. Here, we theoretically propose a primary thermometer based on measurement of a hybrid system consisting of phonons coupled via a magnetostrictive interaction to magnons. Thermometry is based on a cross-correlation measurement in which the spectrum of back-action driven motion is used to scale the thermomechanical motion, providing a direct measurement of the phonon temperature independent of experimental parameters. Combined with a simple low-temperature compatible microwave cavity readout, this primary thermometer is expected to become a promising alternative for thermometry below 1 K.
- Publication:
-
Physical Review Applied
- Pub Date:
- June 2020
- DOI:
- 10.1103/PhysRevApplied.13.064001
- arXiv:
- arXiv:2001.11124
- Bibcode:
- 2020PhRvP..13f4001P
- Keywords:
-
- Physics - Applied Physics;
- Condensed Matter - Mesoscale and Nanoscale Physics;
- Quantum Physics
- E-Print:
- 6 pages plus appendices, 10 figures