Bench-Top Cooling of a Microwave Mode Using an Optically Pumped Spin Refrigerator

Hao Wu, Shamil Mirkhanov, Wern Ng, Mark Oxborrow

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摘要

We experimentally demonstrate the temporary removal of thermal photons from a microwave mode at 1.45 GHz through its interaction with the spin-polarized triplet states of photo-excited pentacene molecules doped within a p-terphenyl crystal at room temperature. The crystal functions electromagnetically as a narrowband cryogenic load, removing photons from the otherwise room-temperature mode via stimulated absorption. The noise temperature of the microwave mode dropped to 50-32+18 K (as directly inferred by noise-power measurements), while the metal walls of the cavity enclosing the mode remained at room temperature. Simulations based on the same system's behavior as a maser (which could be characterized more accurately) indicate the possibility of the mode's temperature sinking to ∼10 K (corresponding to ∼140 microwave photons). These observations, when combined with engineering improvements to deepen the cooling, identify the system as a narrowband yet extremely convenient platform - free of cryogenics, vacuum chambers, and strong magnets - for realizing low-noise detectors, quantum memory, and quantum-enhanced machines (such as heat engines) based on strong spin-photon coupling and entanglement at microwave frequencies.

源语言英语
文章编号053604
期刊Physical Review Letters
127
5
DOI
出版状态已出版 - 30 7月 2021
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Wu, H., Mirkhanov, S., Ng, W., & Oxborrow, M. (2021). Bench-Top Cooling of a Microwave Mode Using an Optically Pumped Spin Refrigerator. Physical Review Letters, 127(5), 文章 053604. https://doi.org/10.1103/PhysRevLett.127.053604