Squeezed vacuum reservoir effect for entanglement decay in nonlinear quantum scissors system

TL;DR

This paper investigates how a broadband squeezed vacuum bath influences entanglement decay in a coupled system of nonlinear oscillators, revealing phenomena like entanglement sudden death, rebirth, and tunable negativity.

Contribution

It demonstrates the impact of squeezed vacuum reservoirs on entanglement dynamics, including control over disentanglement time and maximal negativity in nonlinear quantum systems.

Findings

Entanglement decay can be delayed or accelerated by squeezing parameters.

Sudden entanglement death and rebirth phenomena are observed.

Maximal negativity can be tailored by adjusting squeezing parameters.

Abstract

We discuss the coupler system of two nonlinear oscillators excited by an external coherent field prepared in a maximally entangled state (Bell-like state). We show that as a result of the coupler interaction of the system with external broadband squeezed vacuum bath, entanglement decay dynamics can be considerably affected. Besides the phenomena of sudden entanglement death and its rebirth, a shortening (or lengthening) of the total disentanglement time {\tau}D can be observed, depending on the squeezing parameters. Moreover, on the example of one of the reborn entanglement cases it is shown that by changing the values of these parameters the maximal values of the negativity for the 3 \otimes 2 system discussed can be tailored.