A photonic quantum engine driven by superradiance
Jinuk Kim, Seung-hoon Oh, Daeho Yang, Junki Kim, Moonjoo Lee, Kyungwon, An

TL;DR
This paper demonstrates the first experimental realization of a photonic quantum engine driven by superradiance, achieving high efficiency and power enhancement using quantum coherence in a single heat reservoir.
Contribution
It provides the first proof-of-principle experimental demonstration of a superradiance-driven quantum engine utilizing a single heat reservoir with quantum coherence.
Findings
Engine temperature increased 40-fold due to superradiance.
Engine efficiency approached unity.
Output power scaled quadratically with atomic injection rate.
Abstract
Performance of nano- and micro-scale heat engines can be improved with a help from quantum mechanical phenomena. Recently, heat reservoirs with quantum coherence have been proposed to enhance engine performance beyond the Carnot limit even with a single reservoir. However, no physical realizations have been achieved so far. Here, we report the first proof-of-principle experimental demonstration of a photonic quantum engine driven by superradiance employing a single heat reservoir composed of atoms and photonic vacuum. Reservoir atoms prepared in a quantum coherent superposition state underwent superradiance while traversing the cavity. This led to about 40-fold increase of the effective engine temperature, resulting in a near-unity engine efficiency. Moreover, the observed engine output power grew quadratically with respect to the atomic injection rate. Our work can be utilized in…
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