Quantum technologies require pure states, which are often generated by extreme
refrigeration. Heat-bath algorithmic cooling is the theoretically optimal refrigeration …

We develop a method to transform a collection of higher-dimensional spin systems from the
thermal state with a very high temperature of a local spin-s Hamiltonian to a low-lying energy …

We design a quantum thermal device that can simultaneously and dynamically cool multiple
target qubits. Using a setup with three bosonic heat baths, we propose an engineering of …

We explore a small quantum refrigerator consisting of three qubits each of which are kept in
contact with an environment. We consider two settings: one is when there is necessarily …

We investigate quantum non-equilibrium refrigerators with one-and two-qubit systems in a
squeezed thermal bath. We characterise their performances in the presence of squeezed …