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2014

Clock-Driven Quantum Thermal Engines

Malabarba, Artur S. L., Short, Anthony J., Kammerlander, Philipp

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We consider an isolated autonomous quantum machine, where an explicit quantum clock is responsible for performing all transformations on an arbitrary quantum system (the engine), via a time-independent Hamiltonian.

In a general context, we show that this model can exactly implement any energy-conserving unitary on the engine, without degrading the clock.
Furthermore, we show that when the engine includes a quantum work storage device we can approximately perform completely general unitaries on the remainder of the engine.
This framework can be used in quantum thermodynamics to carry out arbitrary transformations of a system, with accuracy and extracted work as close to optimal as desired, whilst obeying the first and second laws of thermodynamics.

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The continuous-spectrum Hamiltonian was chosen for convenience. It has been shown in [ 3 , 4 ] that discrete weights also work arbitrarily well

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