Superradiant Many-Qubit Absorption Refrigerator
Michal Kloc, Kurt Meier, Kimon Hadjikiriakos, Gernot Schaller · Physical Review Applied · 2021
Cooling fragile quantum systems requires quantum cooling technology. The smallest possible fridge employs a three-level system to autonomously cool the coldest of the three reservoirs. The authors suggest a setup with a quantum working fluid composed of $N$ collectively coupled qubits to effectively implement such a refrigerator. The collective couplings lead to a quadratic boost of the cooling current, $I\ensuremath{\propto}{N}^{2}$.