Converting coherence into work with a fully quantum engine

• URL: http://arxiv.org/abs/2511.06096v1
• Date: Sat, 08 Nov 2025 18:17:50 GMT
• Title: Converting coherence into work with a fully quantum engine
• Authors: MinSik Kwon, Tobias Denzler, Rouven Maier, Vadim Vorobyov, Durga Bhaktavatsala Rao Dasari, Eric Lutz, Jörg Wrachtrup,
• Abstract summary: We report the experimental realization of a fully quantum engine that converts quantum coherence into work.<n>A single solid-state spin in diamond is fueled by a coherent bath and cyclically stores energy in a spin quantum battery.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Heat engines convert thermal energy into mechanical work. We here report the experimental realization of a fully quantum engine that converts quantum coherence into work. A single solid-state spin in diamond is fueled by a coherent bath and cyclically stores energy in a spin quantum battery. We establish quantum-enhanced performance by showing that almost 200$\%$ more work is produced after a few cycle compared to the corresponding classical engine. We obtain concrete criteria for successful coherence-to-work conversion, and highlight the importance of a coherent motor-battery interaction. This device harnesses nonclassical features during all stages of its cycle, and demonstrates the functionality of a nanomachine whose parts are all quantum coherent.

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