Frequency division multiplexing readout and simultaneous manipulation of an array of flux qubits

Abstract

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