Prospects for Strong Cavity Quantum Electrodynamics with Superconducting Circuits

TL;DR

This paper proposes a superconducting circuit architecture using transmission line resonators to achieve strong cavity QED coupling, enabling enhanced quantum control, longer qubit lifetimes, and scalable quantum communication.

Contribution

It introduces a feasible design for strong coupling in superconducting circuits, advancing quantum computing and communication capabilities.

Findings

Coupling frequency exceeds damping rates, enabling strong interaction.

Potential for high-fidelity quantum non-demolition measurements.

Enables entanglement of distant qubits and production of microwave photon states.

Abstract

We propose a realizable architecture using one-dimensional transmission line resonators to reach the strong coupling limit of cavity quantum electrodynamics in superconducting electrical circuits. The vacuum Rabi frequency for the coupling of cavity photons to quantized excitations of an adjacent electrical circuit (qubit) can easily exceed the damping rates of both the cavity and the qubit. This architecture is attractive for quantum computing and control, since it provides strong inhibition of spontaneous emission, potentially leading to greatly enhanced qubit lifetimes, allows high-fidelity quantum non-demolition measurements of the state of multiple qubits, and has a natural mechanism for entanglement of qubits separated by centimeter distances. In addition it would allow production of microwave photon states of fundamental importance for quantum communication.