Generation of macroscopic entangled cat states in a molecular cavity-QED system

TL;DR

This paper proposes a method to generate macroscopic entangled cat states in a molecular cavity-QED system by modulating resonance frequencies, enhancing vibrational displacement, and analyzing quantum coherence and entanglement.

Contribution

It introduces a novel scheme for creating macroscopic entangled states in molecular cavity-QED systems through frequency modulation techniques.

Findings

Successful generation of entangled cat states between vibrational and cavity modes.

Enhanced vibrational displacement via frequency modulation.

Analysis of quantum coherence and entanglement in generated states.

Abstract

Macroscopic entangled cat states not only are significant in the demonstration of the fundamentals of quantum physics, but also have wide applications in modern quantum technologies such as continuous-variable quantum information processing and quantum metrology. Here we propose a scheme for generation of macroscopic entangled cat states in a molecular cavity-QED system, which is composed of an organic molecule (including electronic and vibrational states) coupled to a single-mode cavity field. By simultaneously modulating the resonance frequencies of the molecular vibration and the cavity field, the molecular vibrational displacement can be enhanced significantly and hence macroscopic entangled cat states between the molecular vibrational mode and the cavity mode can be created. We also study quantum coherence effects in the generated states by calculating the joint Wigner function and the degree of entanglement. The dissipation effects are included by considering the state generation in the open-system case. Our results will pave the way to the study of quantum physics and quantum chemistry in molecular cavity-QED systems.