Phys Rev Lett. 2025 May 23;134(20):200402. doi: 10.1103/PhysRevLett.134.200402.
ABSTRACT
We introduce a single-qubit quantum measurement engine fuelled by backaction energy input. To reduce energetic costs associated with information processing, the measurement outcomes are only used with a prescribed laziness probability in the feedback step. As a result, we show that the work extracted over consecutive cycles is a second-order Markov process, analogous to a run-and-tumble process with transient anomalous diffusion. We derive exact analytical expressions for the work finite-time moments and first-passage-time statistics. Furthermore, we find the optimal laziness probability maximizing the mean power extracted per cycle.
PMID:40479676 | DOI:10.1103/PhysRevLett.134.200402
