Radiation induced interaction potential of two qubits strongly coupled with a quantized electromagnetic field

TL;DR

This paper explores how two strongly coupled qubits interact via a radiation-induced potential in a cavity, revealing distance-dependent properties that enable quantum control for information processing.

Contribution

It introduces a detailed analysis of radiation-induced interactions between two qubits at arbitrary distances without the rotating wave approximation.

Findings

Interaction potential depends on qubit distance in strong coupling regime

Numerical and analytical methods confirm distance-dependent properties

Potential for quantum control and information transmission

Abstract

We investigate the interaction of two two-level qubits with a single mode quantum field in a cavity without rotating wave approximation and considering that qubits can be located at an arbitrary distance from each other. We demonstrate that there exists a radiation induced interaction potential between atoms. We studied the properties of the system numerically and in addition constructed a simple analytical approximation. It is shown that the observable characteristics are substantially dependent on the distance between the qubits in the strong coupling regime. This allows one to perform the quantum control of the qubits, which can be exploited for the recording and transmission of quantum information.