arXiv:0912.3407 · Nature
Phase-preserving amplification near the quantum limit with a Josephson ring modulator
N. Bergeal, Flavius Schackert, Michael Metcalfe, Rajamani Vijay, Vladimir Manucharyan, Luigi Frunzio, D. E. Prober, Robert J. Schoelkopf, S. M. Girvin, Michel Devoret