Process tomography of quantum memory in a Josephson-phase qubit coupled to a two-level state

Matthew Neeley, Ansmann, M. , Bialczak, Radoslaw C, Hofheinz, M. , Katz, N. , Lucero, Erik , O'Connell, A. , Wang, H. , Cleland, A. N, and Martinis, John M. 2008. “Process Tomography Of Quantum Memory In A Josephson-Phase Qubit Coupled To A Two-Level State”. Nature Physics, 4, Pp. 523-526. doi:10.1038/nphys972.