Spectroscopy of a Qubit Array via a Single Transmission Line
  Frequency-selective readout for superconducting qubits opens the way towards scaling qubit circuits up without increasing the number of measurement lines. Here we demonstrate the readout of an array of 7 flux qubits located on the same chip. Each qubit is placed near an individual lambda/4 resonator which, in turn, is coupled to a common microwave transmission line. We performed spectroscopy of all qubits and determined their parameters in a single measurement run. 
M. Jerger, S. Poletto, P. Macha, U. Huebner, A. Lukashenko, E.   Il'ichev, A. V. Ustinov
cond-mat.supr-con physics.ins-det quant-ph