Imperial College London
Alternate

ProfessorMarkOxborrow

Faculty of Engineering, Department of Materials

Professor in Functional Microwave Materials
 
 
 
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Contact

 

+44 (0)20 7594 1410m.oxborrow

 
 
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Location

 

2.04Royal School of MinesSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Wu:2021:10.1103/PhysRevLett.127.053604,
author = {Wu, H and Mirkhanov, S and Ng, W and Oxborrow, M},
doi = {10.1103/PhysRevLett.127.053604},
journal = {Physical Review Letters},
pages = {1--6},
title = {Bench-top cooling of a microwave mode using an optically pumped spin refrigerator},
url = {http://dx.doi.org/10.1103/PhysRevLett.127.053604},
volume = {127},
year = {2021}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - We experimentally demonstrate the temporary removal of thermal photons from a microwavemode at 1.45 GHz through its interaction with the spin-polarized triplet states of photo-excitedpentacene molecules doped within a p-terphenyl crystal at room temperature. The crystal functions electromagnetically as a narrow-band cryogenic load, removing photons from the otherwiseroom-temperature mode via stimulated absorption. The noise temperature of the microwave modedropped to 50+18−32 K (as directly inferred by noise-power measurements) while the metal walls of thecavity enclosing the mode remained at room temperature. Simulations based on the same system’sbehavior as a maser (which could be characterized more accurately) indicate the possibility of themode’s temperature sinking to ∼10 K (corresponding to ∼140 microwave photons).These observations, when combined with engineering improvements to deepen the cooling, identify the systemas a narrow-band yet extremely convenient platform —free of cryogenics, vacuum chambers andstrong 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 microwavefrequencies.
AU  - Wu,H
AU  - Mirkhanov,S
AU  - Ng,W
AU  - Oxborrow,M
DO  - 10.1103/PhysRevLett.127.053604
EP  - 6
PY  - 2021///
SN  - 0031-9007
SP  - 1
TI  - Bench-top cooling of a microwave mode using an optically pumped spin refrigerator
T2  - Physical Review Letters
UR  - http://dx.doi.org/10.1103/PhysRevLett.127.053604
UR  - https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.127.053604
UR  - http://hdl.handle.net/10044/1/89326
VL  - 127
ER  -
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