Strong Coupling of a Cavity QED Architecture for a Current-biased Flux Qubit

TL;DR

This paper proposes a cavity QED architecture for a current-biased flux qubit with asymmetric Josephson junctions, enabling strong coupling between the qubit and a transmission line resonator for improved quantum control.

Contribution

It introduces a novel scheme for coupling a current-biased flux qubit to a resonator, enhancing qubit-resonator interaction strength.

Findings

Achieves strong coupling between flux qubit and resonator

Utilizes asymmetric Josephson junctions for effective bias current coupling

Provides a new approach for quantum information processing with superconducting qubits

Abstract

We propose a scheme for a cavity quantum electrodynamics (QED) architecture for a current-biased superconducting flux qubit with three Josephson junctions. The qubit operation is performed by using a bias current coming from the current mode of the circuit resonator. If the phase differences of junctions are to be coupled with the bias current, the Josephson junctions should be arranged in an asymmetric way in the qubit loop. Our QED scheme provides a strong coupling between the flux qubit and the transmission line resonator of the circuit.