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We consider a quantum Otto cycle operating between two squeezed thermalreservoirs. The influences of the squeezing degree on the optimizationperformance of quantum Otto heat engines and refrigerators are investigated. Wedemonstrate that under symmetric condition, the efficiency at maximum power(EMP) of heat engines and the coefficient of performance (COP) at maximum\c{hi} criterion of refrigerators are equal to Curzon-Ahlborn (CA) efficiencyand CA COP, respectively. We also found that under asymmetric condition, theEMP of heat engines can be improved when the squeezing degree of hot thermalreservoir is greater than that of the cold thermal reservoir, and be reduced oreven inhibited in the opposite condition. However, the COP at maximum \c{hi}criterion of refrigerators can be enhanced when the squeezing degree of coldthermal reservoir is greater than that of the hot thermal reservoir, and bereduced or even inhibited in the opposite condition.

Optimization performance of quantum Otto heat engines and refrigerators with squeezed thermal reservoirs