Full coherent frequency conversion between two microwave propagating   modes
  We demonstrate full frequency conversion in the microwave domain using a Josephson three-wave mixing device pumped at the difference between the frequencies of its fundamental eigenmodes. By measuring the signal output as a function of the intensity and phase of the three input signal, idler and pump tones, we show that the device functions as a controllable three-wave beam-splitter/combiner for propagating microwave modes, in accordance with theory. Losses at the full conversion point are found to be less than 10^-2. Potential applications of the device include quantum information transduction and realization of an ultra-sensitive interferometer with controllable feedback. 
Baleegh Abdo, Katrina Sliwa, Flavius Schackert, Nicolas Bergeal,   Michael Hatridge, Luigi Frunzio, A. Douglas Stone, Michel...
cond-mat.supr-con