Experimental Demonstration of a Measurement-Feedback Quantum Information Engine
Source: Originally published on arXiv quant-ph on August 3, 2026.
arXiv:2607.28702v1 Announce Type: new Abstract: Harnessing quantum inner friction in a finite-time stroke of quantum engine to extract work remains an open experimental challenge. Here we address this issue by experimentally establishing and demonstrating an innovative measurement-feedback quantum information engine model in the trapped 40Ca+ ion system, where the projective measurement replaces the hot reservoir as a nonthermal energy source and feedback-control conditionally steers the system through either unitary compression-expansion strokes or thermalization. We experimentally show that the engine, starting from arbitrary initial states, converges to a stable operating regime with a fully resolved energetic balance, and by controlling the measurement angle and stroke duration, the me...
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