A quantum mechanical Maxwell demon is proposed in a quantum dot setting. The demon avoids continuous-measurement-induced decoherence by exploiting an undetailed charge detector. The control of coherent tunneling via Landau-Zener-Stückelberg-Majorana driving allows for efficient feedback operations with no work invested. The local violation of the second law achieves simultaneous power generation and cooling. We discuss the response current fluctuations, and the demon backaction derived from failures, finding optimal performance in the nonadiabatic regime.

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• Coulomb blockade
• Landau-Zener effect
• Open quantum systems
• Quantum measurements
• Quantum stochastic processes
• Quantum thermodynamics
• Quantum transport
• Double quantum dots
• Quantum heat engines & refrigerators
• Density matrix methods
• Markovian processes
• Master equation
• Quantum Monte Carlo