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We introduce quantum information engines that extract work from quantumstates and a single thermal reservoir. They may operate under three generalconditions: i/ Unitarily Steered evolution (US); ii/ IrreversibleThermalization (IT) and iii/ Isothermal Relaxation (IR), and hence are calledUSITIR machines. They include novel engines without traditional feedbackcontrol mechanisms, as well as versions which also include them. Explicitconstructions of USITIR engines are presented for one- and two-qubit states andtheir maximum extractable work is computed, which is optimal. Optimality isachieved when the notions of controllable thermalizability and density matrixcontrollability are fullfilled. Then, many-body extensions of USITIR enginesare also analyzed and conditions for optimal work extraction are identified.When they are not met, we measure their lack of optimality by means of newlydefined uncontrollable entropies, that are explicitly computed for someselected examples. This includes cases of distinguishable and indistinguishableparticles.

Quantum Information Engines with Many-Body States attaining optimal Extractable Work with Quantum Control