Cryogenic electro-optic interconnect for superconducting devices

摘要: Encoding information onto optical fields is the backbone of modern telecommunication networks. Optical fibers offer low loss transport and vast bandwidth compared to electrical cables, are currently also replacing coaxial cables for short-range communications. exhibit significantly lower thermal conductivity, making interconnects attractive interfacing with superconducting circuits devices. Yet little known about modulation at cryogenic temperatures. Here we demonstrate a proof-of-principle experiment, showing that employed Ti-doped LiNbO modulators maintain Pockels coefficient 3K---a base temperature classical microwave amplifier circuitry. We realize electro-optical read-out electromechanical circuit perform both coherent spectroscopy, measuring optomechanically-induced transparency, incoherent thermometry, encoding thermomechanical sidebands in an signal. Although achieved noise figures high, approaches match lower-bandwidth signals, use integrated devices or materials higher EO coefficient, should achieve added similar current HEMT amplifiers, providing route parallel readout emerging quantum computing platforms.