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We show that quantum absorption refrigerators, which have traditionally beenstudied as of three qubits, each of which is connected to a thermal reservoir,can also be constructed by using three qubits and two thermal baths, where twoof the qubits, including the qubit to be locally cooled, are connected to acommon bath. With a careful choice of the system, bath, and qubit-bathinteraction parameters within the Born-Markov and rotating-wave approximations,one of the qubits attached to the common bath achieves a cooling in the steadystate. We observe that the proposed refrigerator may also operate in aparameter regime where no or negligible steady-state cooling is achieved, butthere is considerable transient cooling. The steady-state temperature can belowered significantly by an increase in the strength of the few-bodyinteraction terms existing due to the use of the common bath in therefrigerator setup. The proposed refrigerator built with three qubits and twobaths is shown to provide steady-state cooling for both Markovian qubit-bathinteractions between the qubits and canonical bosonic thermal reservoirs, and asimpler reset model for the qubit-bath interactions.

Three qubits in less than three baths: Beyond two-body system-bath interactions in quantum refrigerators