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Description
We propose a triply-resonant electro-optic modulator as an efficient stationary source of entangled microwave and optical radiation, based on a mm-sized high optical $Q$ lithium niobate whispering gallery mode resonator (WGMR) coupled to a superconducting 3D microwave cavity. The creation of entangled microwave and optical photons is possible via spontaneous parametric down conversion (SPDC) in the lithium niobate WGMR. By profiting from the resonance intensity build-up of the modes, the device can achieve creation rates of $\sim10^6$ entangled bits/s for conservative system parameters at optical pump powers in the order of tens of $\mu$W. Furthermore, the implementation of this device as an Einstein-Podolski-Rosen source in a Braunstein-Kimble teleportation set-up allows quantum state transfer between microwave and optical Gaussian states.
