Experimental realization of three-color entanglement at optical fiber communication and atomic storage wavelengths

TL;DR

This paper reports the experimental creation of three-color entangled light at wavelengths suitable for optical fiber communication and atomic storage, advancing quantum networks with practical, tunable entanglement sources.

Contribution

The study demonstrates a novel, tunable system generating three-color entanglement at specific wavelengths for quantum communication and storage applications.

Findings

Successful generation of three-color entanglement at 852 nm, 1550 nm, and 1440 nm.

Use of cascaded NOPOs allows flexible frequency selection.

Potential for practical quantum information network devices.

Abstract

Multi-color entangled states of light including low-loss optical fiber transmission and atomic resonance frequencies are essential resources for future quantum information network. We present the experimental achievement on the three-color entanglement generation at 852 nm, 1550 nm and 1440 nm wavelengths for optical continuous variables. The entanglement generation system consists of two cascaded non-degenerated optical parametric oscillators (NOPOs). The flexible selectivity of nonlinear crystals in the two NOPOs and the tunable property of NOPO provide large freedom for the frequency selection of three entangled optical beams, so the present system is possible to be developed as practical devices used for quantum information networks with atomic storage units and long fiber transmission lines.