Multiplexing Superconducting Qubit Circuit for Single Microwave Photon Generation

TL;DR

This paper presents a multiplexed superconducting qubit circuit capable of generating single microwave photons with high efficiency, integrating multiple qubits and resonators for scalable quantum information processing.

Contribution

The work introduces a multiplexing architecture for superconducting qubits that allows individual control and characterization, enhancing scalability and photon generation efficiency.

Findings

Device parameters match design specifications

Resonators and qubits show excellent coherence

Photon generation efficiency exceeds 80%

Abstract

We report on a device that integrates eight superconducting transmon qubits in lambda/4 superconducting coplanar waveguide resonators fed from a common feedline. Using this multiplexing architecture, each resonator and qubit can be addressed individually thus reducing the required hardware resources and allowing their individual characterisation by spectroscopic methods. The measured device parameters agree with the designed values and the resonators and qubits exhibit excellent coherence properties and strong coupling, with the qubit relaxation rate dominated by the Purcell effect when brought in resonance with the resonator. Our analysis shows that the circuit is suitable for generation of single microwave photons on demand with an efficiency exceeding 80%.