TY - JOUR KW - pfc AU - M. Castellanos-Beltran AU - K. Irwin AU - G. Hilton AU - Leila Vale AU - Konrad Lehnert BT - Nature Physics DA - 2008-12 DO - 10.1038/nphys1090 PY - 2008 SP - 929 EP - 931 T2 - Nature Physics TI - Amplification and squeezing of quantum noise with a tunable Josephson metamaterial VL - 4 SN - 1745-2473 ER -