Spectroscopy of a Qubit Array via a Single Transmission Line

TL;DR

This paper demonstrates a scalable method for reading out multiple superconducting qubits using a single transmission line, enabling efficient spectroscopy and parameter determination of a 7-qubit array.

Contribution

The study introduces a frequency-selective readout technique for superconducting qubits that allows simultaneous measurement of multiple qubits via a single transmission line.

Findings

Successful spectroscopy of all 7 qubits in one measurement

Determined individual qubit parameters efficiently

Showed feasibility of scalable qubit readout systems

Abstract

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.