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We derive an efficiency bound for continuous quantum heat engines absorbingheat from squeezed thermal reservoirs. Our approach relies on a full-countingstatistics description of nonequilibrium transport and it is not limited to theframework of irreversible thermodynamics. Our result, a generalized Carnotefficiency bound, is valid beyond the small squeezing and high temperaturelimit. Our findings are embodied in a prototype three-terminal quantumphotoelectric engine where a qubit converts heat absorbed from a squeezedthermal reservoir into electrical power. We demonstrate that in the quantumregime the efficiency can be greatly amplified by squeezing. From thefluctuation relation we further receive other operational measures in linearresponse, for example, the universal maximum power efficiency bound.

Quantum efficiency bound for continuous heat engines coupled to non-canonical reservoirs