Nonequilibrium fluctuations in quantum heat engines: theory, example, and possible solid state experiments

Michele Campisi, Jukka Pekola, Rosario Fazio
2015 New Journal of Physics  
We study the stochastic energetic exchanges in quantum heat engines. Due to microreversibility, these obey a fluctuation relation, called the heat engine fluctuation relation, which implies the Carnot bound: no machine can have an efficiency larger than Carnot's efficiency. The stochastic thermodynamics of a quantum heat engine (including the joint statistics of heat and work and the statistics of efficiency) is illustrated by means of an optimal two-qubit heat engine, where each qubit is
more » ... each qubit is coupled to a thermal bath and a two-qubit gate determines energy exchanges between the two qubits. We discuss possible solid state implementations with Cooper pair boxes and flux qubits, quantum gate operations, and fast calorimetric on-chip measurements of single stochastic events.
doi:10.1088/1367-2630/17/3/035012 fatcat:5mhlrpvwmbfu3lbt4so7eikvly