The quantum interconnect (QuIC) is critical for scalable quantum ecosystems. An ideal QuIC should contain: a quantum memory, an entanglement source and a quantum transducer. With the development of these functionalities, current leading qubit technologies, such as superconducting and photonic qubits, will become viable and a hybrid approach to quantum computing can be taken, solving the current scalability crisis. We here describe our approach using an optical quantum memory and optically-heralded distribution of microwave entanglement based on a ladder-type two photon optical process and coupling to electron spin sublevels in an ensemble of Er ions in a stoichiometric host crystal.
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