Frequency Division Multiplexing Readout and Simultaneous Manipulation of an Array of Flux Qubits

Research paper by Markus Jerger, Stefano Poletto, Pascal Macha, Uwe Hübner, Evgeni Il'ichev, Alexey V. Ustinov

Indexed on: 12 Jul '12Published on: 12 Jul '12Published in: Quantum Physics


An important desired ingredient of superconducting quantum circuits is a readout scheme whose complexity does not increase with the number of qubits involved in the measurement. Here, we present a readout scheme employing a single microwave line, which enables simultaneous readout of multiple qubits. Consequently, scaling up superconducting qubit circuits is no longer limited by the readout apparatus. Parallel readout of 6 flux qubits using a frequency division multiplexing technique is demonstrated, as well as simultaneous manipulation and time resolved measurement of 3 qubits. We discuss how this technique can be scaled up to read out hundreds of qubits on a chip.