Entanglement and nonlocality of one- and two-mode combination squeezed state

TL;DR

This paper analyzes the entanglement and nonlocality of a novel two-parameter combination squeezed vacuum state, demonstrating its superior entanglement, stronger Bell inequality violation, and improved quantum teleportation fidelity compared to traditional two-mode squeezed states.

Contribution

It introduces the OTCSS with two parameters, showing enhanced entanglement and nonlocality, and demonstrates its advantages in quantum teleportation over standard states.

Findings

OTCSS exhibits larger entanglement than TSVS.

In certain regimes, OTCSS shows more significant Bell inequality violation.

OTCSS can achieve higher teleportation fidelity than TSVS.

Abstract

We investigate the entanglement and nonlocality properties of one- and two-mode combination squeezed vacuum state (OTCSS, with two-parameter lamda and gamma) by analyzing the logarithmic negativity and the Bell's inequality. It is found that this state exhibits larger entanglement than that of the usual two-mode squeezed vacuum state (TSVS), and that in a certain regime of lamda, the violation of Bell's inequality becomes more obvious, which indicates that the nonlocality of OTCSS can be stronger than that of TSVS. As an application of OTCSS, the quantum teleportaion is examined, which shows that there is a region spanned by lamda and gamma in which the fidelity of OTCSS channel is larger than that of TSVS.