A quantum two-level system with periodically modulated energy splitting could provide a minimal universal quantum heat machine. We present the experimental realization and the theoretical description of such a two-level system as an impurity electron spin in a silicon tunnel field-effect transistor. In the incoherent regime, the system can behave analogously to either an Otto heat engine or a refrigerator. The coherent regime could be described as a superposition of those two regimes, producing specific interference fringes in the observed source-drain current.

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• Coherent control
• Landau-Zener effect
• Mesoscopics
• Quantum interference effects
• Quantum master equation
• Quantum transport
• Spin blockade
• Double quantum dots
• Field-effect transistors
• Heat engines