Controlling and swapping quantum information in a quantum coherent waybetween the microwave and optical regimes is essential for building long-rangesuperconducting quantum networks but extremely challenging. We propose a hybridquantum interface between the microwave and optical domains where thepropagation of a single-photon pulse along a nanowaveguide is controlled in acoherent way by tuning electromagnetically induced transparency window with thequantum state of a flux qubit. The qubit can route a single-photon pulse with asingle spin in nanodiamond into a quantum superposition of paths without theaid of an optical cavity - simplifying the setup. By preparing the flux qubitin a superposition state our cavity-less scheme creates a hybrid state-pathentanglement between a flying single optical photon and a staticsuperconducting qubit, and can conduct heralded quantum state transfer viameasurement.
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