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Single-photon sources are of great interest because they are key elements indifferent promising applications of quantum technologies. Here we demonstrate ahighly efficient tunable on-demand microwave single-photon source based on atransmon qubit with the intrinsic emission efficiency above 98$\%$. The highefficiency ensures a negligible pure dephasing rate and the necessary conditionfor generation of indistinguishable photons. We provide an extended discussionand analysis of the efficiency of the photon generation. To furtherexperimentally confirm the single-photon property of the source, correlationfunctions of the emission field are also measured using linear detectors with aGPU-enhanced signal processing technique. Our results experimentallydemonstrate that frequency tunability and negligible pure dephasing rate can beachieved simultaneously and show that such a tunable single-photon source canbe good for various practical applications in quantum communication,simulations and information processing in the microwave regime.

Tunable Microwave Single-photon Source Based on Transmon Qubit with High Efficiency