A new theoretical analysis shows that nonlocal correlations of the quantum steering type can be used to extract heat from a thermal bath more efficiently than conventional quantum cooling schemes. The work positions steering —the quantum resource intermediate between entanglement and Bell nonlocality— as a practical tool for refrigerating quantum devices.

Quantum cooling typically relies on quantum correlations to transfer energy from a target system to a hotter bath, in apparent contradiction with the spontaneous flow of heat but consistent with thermodynamics when external work is supplied. Most protocols so far have used entangled states; the new study examines what happens when the only available resource is steering, a weaker form of correlation.

The central result is that steering correlations suffice to improve the performance of the cooling process compared with classical strategies and with quantum protocols lacking steering. The improvement shows up in the amount of heat extracted from the bath per cycle and in the efficiency of the resulting quantum refrigerator.

The proposal connects two fields that have been little related until now: quantum resource theory, which classifies correlations hierarchically, and quantum thermodynamics, which seeks fundamental limits for thermal machines at the atomic scale. By identifying steering as a thermodynamically useful resource, the work opens the door to designing quantum refrigerators that operate with weaker correlations and are therefore easier to generate and maintain against decoherence.

Potential applications include cooling superconducting qubits and other quantum devices sensitive to thermal noise, where removing residual heat is a bottleneck for coherence. Experimental verification of the proposed advantage in concrete implementations, and quantification of its robustness against imperfections, remain to be done.