Cavity quantum electrodynamics for superconducting electrical circuits: an architecture for quantum computation

TL;DR

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

Contribution

It introduces a realizable architecture for strong coupling in superconducting circuits, facilitating improved quantum computation and communication.

Findings

Achieves strong coupling exceeding damping rates.

Enables high-fidelity quantum non-demolition measurements.

Supports entanglement of distant qubits.

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 both as a macroscopic analog of atomic physics experiments and 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.