Developement of an optomechanical device for microwave to telecom wavelength quantum state transfer

A promising hardware platform for quantum computers is based on solid-state superconducting circuits which offer fast processing times and scalability. Circuit QED systems can however only operate in ultra-cold environments where thermal noise and resistive losses are negligible. We are working on an integrated optomechanical microwave-photonic device which has the potential to efficiently convert microwave excitations to telecom wavelength photons. Such a device would put within reach the realization of hybrid and long distance quantum communication networks. We have designed and fabricated slot mode photonic crystal cavities which share a mechanical mode with the capacitance of a lumped element microwave resonator. A continuously pumped state transfer protocol should enable efficient wavelength conversion even in the absence of strong optomechanical and electromechanical coupling [1] and has recently been demonstrated within the optical domain [2]. We will present our latest progress with the design, fabrication and characterization of our electro-optomechanical wavelength conversion device.\\[4pt] [1] A.~H.~Safavi-Naeini and O.~Painter, New J.~Phys.~13, 013017 (2011)\\[0pt] [2] J.~T.~Hill, A.~H.~Safavi-Naeini, J.~Chan and O.~Painter, arXiv:1206.0704