  An implementation of a small quantum absorption refrigerator in a circuit QED
architecture is proposed. The setup consists of three harmonic oscillators
coupled to a Josephson unction. The refrigerator is autonomous in the sense
that it does not require any external control for cooling, but only thermal
contact between the oscillators and heat baths at different temperatures. In
addition, the setup features a built-in switch, which allows the cooling to be
turned on and off. If timing control is available, this enables the possibility
for coherence-enhanced cooling. Finally, we show that significant cooling can
be achieved with experimentally realistic parameters and that our setup should
be within reach of current technology.
