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A nonclassical light source is essential for implementing a wide range ofquantum information processing protocols, including quantum computing,networking, communication, and metrology. In the microwave regime, propagatingphotonic qubits that transfer quantum information between multiplesuperconducting quantum chips serve as building blocks of large-scale quantumcomputers. In this context, spectral control of propagating single photons iscrucial for interfacing different quantum nodes with varied frequencies andbandwidth. Here we demonstrate a microwave quantum light source based onsuperconducting quantum circuits that can generate propagating single photons,time-bin encoded photonic qubits and qudits. In particular, the frequency ofthe emitted photons can be tuned in situ as large as 200 MHz. Even though theinternal quantum efficiency of the light source is sensitive to the workingfrequency, we show that the fidelity of the propagating photonic qubit can bewell preserved with the time-bin encoding scheme. Our work thus demonstrates aversatile approach to realizing a practical quantum light source for futuredistributed quantum computing.

Frequency-tunable microwave quantum light source based on superconducting quantum circuits