Maxwell’s demon plays a central role in thermodynamics of quantum information, yet a full experimental characterization is still missing in the quantum regime. The Quantum Electronics team used superconducting circuits to realize a quantum Maxwell demon in which all thermodynamic quantities can be controlled and measured. Using power detection resolved at the single microwave photon level and unprecedented tomography techniques, we directly measured the extracted work while tracking the qubit and cavity entropies and energies. We were thus able to fully characterize the demon’s memory after the work extraction and showed that it takes full part in the thermodynamic process. The experiment establishes superconducting circuits as a testbed well suited to perform quantum thermodynamics experiments.
For more information, see the paper published in PNAS by clicking here