Parity-preserving light-matter system mediates effective two-body interactions

TL;DR

This paper explores a parity-preserving light-matter system that enables strong two-qubit interactions and enhanced excitation transfer, with potential applications in quantum information and exciton transport.

Contribution

It introduces a method to achieve effective two-qubit interactions via an ultrastrong coupled qubit-cavity system while maintaining parity protection.

Findings

Strong two-qubit interactions demonstrated.

Enhanced excitation transfer between qubits.

Potential for quantum information and exciton transport applications.

Abstract

We study the equilibrium and non-equilibrium physics of two qubits interacting through an ultrastrong coupled qubit-cavity system. By tuning the qubits energy gap while keeping the ultrastrong coupling system to its ground state, we demonstrate a strong two-qubit interaction as well as an enhanced excitation transfer between the two qubits. Our proposal has twofold implications: a means to attain multipurpose parity-protected quantum information tasks in superconducting circuits, and a building block for ultrastrong coupled cavity-enhanced exciton transport in disordered media.