Doppler-broadened quantum electromagnetically-induced-transparency heat engines

Year: 2021

Authors: Zhang XJ., La Rocca GC., Artoni M., Wang HH., Wu JH.

Autors Affiliation: Northeast Normal Univ, Sch Phys, Changchun 130024, Peoples R China; Scuola Normale Super Pisa, I-56126 Pisa, Italy; CNISM, I-56126 Pisa, Italy; European Lab Nonlinear Spect, I-50019 Florence, Italy; CNR, Natl Inst Opt, I-50019 Florence, Italy; Jilin Univ, Coll Phys, Changchun 130023, Peoples R China.

Abstract: A nontraditional quantum heat engine based on electromagnetically induced transparency has recently been suggested and experimentally demonstrated in ultracold atoms. In more practical setups with warm atoms, thermal atomic motions might hamper this heat engine mechanism. We here show that a Doppler-broadened atomic sample can still behave like an engine. However, only photons emitted in the direction of the coupling laser have the same brightness as for the Doppler-free engine, while the larger the angular deviation of emission, the lower the brightness. Our results suggest that the lower brightness can be seen as an act of Doppler broadening as if the thermal occupation number of the reservoir serving as entropy sink is increased, and the quantum heat engines may be feasible in warm atomic interfaces.

Journal/Review: PHYSICAL REVIEW A

Volume: 103 (6)      Pages from: 62205-1  to: 62205-6

More Information: This work is funded by a grant from the Italian Ministry of Foreign Affairs and International Cooperation (Grant No. PGR00960) and the National Natural Science Foundation of China (Grants No. 11861131001, No. 12074061 and No. 61590930).
KeyWords: Atoms; Heat engines; Luminance; Transparency; Angular deviations; Atomic sample; Coupling lasers; Electromagnetically-induced transparency; Occupation numbers; Quantum heat engines; Thermal atomic motion; Ultracold atoms; Doppler effect
DOI: 10.1103/PhysRevA.103.062205

Citations: 4
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