Multiplexed dispersive readout of superconducting phase qubits

TL;DR

This paper presents a frequency-multiplexed readout method for superconducting phase qubits, enabling simultaneous measurement of multiple qubits through a single line, which enhances scalability and efficiency.

Contribution

The authors develop a multiplexed readout scheme for superconducting qubits, demonstrating simultaneous readout of four qubits with a single measurement line, advancing scalable quantum computing.

Findings

Successful simultaneous readout of four qubits

Efficient use of a single measurement line

Potential for scaling to larger qubit systems

Abstract

We introduce a frequency-multiplexed readout scheme for superconducting phase qubits. Using a quantum circuit with four phase qubits, we couple each qubit to a separate lumped-element superconducting readout resonator, with the readout resonators connected in parallel to a single measurement line. The readout resonators and control electronics are designed so that all four qubits can be read out simultaneously using frequency multiplexing on the one measurement line. This technology provides a highly efficient and compact means for reading out multiple qubits, a significant advantage for scaling up to larger numbers of qubits.