TY - JOUR AU - Jiansong Gao AU - Kent Irwin AU - Gene Hilton AU - John Mates AU - Daniel Schmidt AU - Leila Vale AU - Konrad Lehnert AU - Francois Mallet AU - Jonas Zmuidzinas C2 - Physical Review Letters DA - 2011-06-09 DO - https://doi.org/10.1063/1.3597156 LA - en M1 - 98 PB - Physical Review Letters PY - 2011 TI - Strongly quadrature-dependent noise in superconducting microresonators measured at the vacuum-noise limit ER -