# Circuit QED with a Flux Qubit Strongly Coupled to a Coplanar Transmission Line Resonator

## TL;DR

This paper proposes a circuit QED setup with a flux qubit strongly coupled to a coplanar resonator, enabling strong coupling and potential applications in quantum measurement and photon generation.

## Contribution

It introduces a realistic scheme for achieving strong coupling in circuit QED with flux qubits and discusses its applications in quantum metrology.

## Key findings

- Strong coupling regime is achievable with realistic parameters.
- Potential for single photon generation and quantum non-demolition measurements.
- Feasibility of circuit QED with flux qubits demonstrated.

## Abstract

We propose a scheme for circuit quantum electrodynamics with a superconducting flux-qubit coupled to a high-Q coplanar resonator. Assuming realistic circuit parameters we predict that it is possible to reach the strong coupling regime. Routes to metrological applications, such as single photon generation and quantum non-demolition measurements are discussed.