Quantum correlations change heat flow in nanoscale devices by altering how energy-carrying excitations share information and phase relationships. At the scale of quantum dots, superconducting circuits, and molecular junctions, quantum correlations such as coherence and entanglement make thermal currents sensitive to interference, level hybridization, and nonlocal coupling to reservoirs. Experimentalists and theorists studying these effects report behavior that departs from classical Fourier-like heat conduction and opens routes to controllable thermal devices. Jukka P. Pekola at Aalto University has demonstrated experimentally that superconducting and single-electron structures show nonclassical heat transport signatures, and Massimiliano Esposito at University of Luxembourg has developed theoretical frameworks that explain how coherence and correlated transitions modify steady-state and transient heat currents.
Mechanisms
At the microscopic level, coherence maintains fixed phase relationships between energy eigenstates, enabling destructive or constructive interference in energy transfer pathways. This can suppress heat flow when interference blocks transmission channels or enhance it when pathways reinforce each other. Entanglement creates correlations between spatially separated degrees of freedom so that energy exchanges are no longer independent; heat can flow through correlated many-body states rather than single-particle channels. The net effect depends on system-bath coupling strength, spectral properties of reservoirs, and temperature differences. Environmental noise and decoherence break correlations and restore classical-like behavior, so experimental control of dissipation and measurement back-action is crucial.
Device-level consequences
Practically, quantum-correlated heat transport affects thermoelectric conversion, on-chip refrigeration, and thermal management in quantum processors. Correlation-enabled rectification and negative differential thermal conductance permit thermal diodes and transistors with performance unattainable classically. For quantum computing hardware, suppressed unwanted heat channels can reduce decoherence but also complicate engineered dissipation needed for initialization. Materials, fabrication variability, and phonon coupling introduce cultural and territorial dimensions: research centers with access to cryogenic facilities and nanofabrication—from university labs to national institutes—drive advances, while environmental considerations push for energy-efficient designs in computing and sensing.
Overall, understanding and controlling quantum correlations is central to translating nanoscale thermodynamic phenomena into reliable technologies. Progress is an interdisciplinary effort combining precise experiments, as exemplified by Jukka P. Pekola at Aalto University, with rigorous theory such as work by Massimiliano Esposito at University of Luxembourg, to quantify when correlations help, hinder, or qualitatively reshape heat transport.