Entanglement dynamics of a dc SQUID interacting with a single-mode radiation field

TL;DR

This paper investigates how a dc SQUID, modeled as an artificial atom, interacts with a single-mode radiation field to facilitate quantum information transfer and entanglement generation, highlighting its potential in quantum technology applications.

Contribution

It demonstrates entanglement dynamics and quantum information transference between a superconducting device and a radiation field, advancing understanding of superconducting quantum systems.

Findings

Population transfer induces entanglement dynamics.

Photon pairs are generated through energy level interactions.

Quantum coherence is transmitted from the device to photons.

Abstract

In this work, we study the coupling between a superconducting device as a dc SQUID, simulated from an artificial atom with two degrees of freedom, and a single-mode radiation field for the information transference process. We demonstrate that the population transfer among the energy levels of the artificial atom yields an entanglement dynamics, which leads to the generation of a pair of photons. Moreover, we show the quantum information transference between the internal modes of the superconducting device, initially in a maximally entangled state, and the radiation field. The artificial atom absorbs the photon, and the radiation field modes become entangled as quantum coherence is transmitted from the superconducting device to the photons. These results strengthen the applicability of superconducting devices for the transference of quantum information, contributing to promising applications in emerging quantum technologies.