Generation of pure continuous-variable entangled cluster states of four separate atomic ensembles in a ring cavity

TL;DR

This paper presents a practical method for generating pure continuous-variable entangled cluster states of four atomic ensembles in a ring cavity using only dispersive interactions and laser pulses, avoiding complex external resources.

Contribution

It introduces a novel scheme that creates pure entangled cluster states without external squeezed fields or beam splitter networks, simplifying experimental implementation.

Findings

Successfully generates pure continuous-variable cluster states.

Demonstrates creation of linear, square, and T-type cluster states.

Avoids the need for external squeezed inputs or complex optical setups.

Abstract

A practical scheme is proposed for creation of continuous variable entangled cluster states of four distinct atomic ensembles located inside a high-finesse ring cavity. The scheme does not require a set of external input squeezed fields, a network of beam splitters and measurements. It is based on nothing else than the dispersive interaction between the atomic ensembles and the cavity mode and a sequential application of laser pulses of a suitably adjusted amplitudes and phases. We show that the sequential laser pulses drive the atomic "field modes" into pure squeezed vacuum states. The state is then examined against the requirement to belong to the class of cluster states. We illustrate the method on three examples of the entangled cluster states, the so-called continuous variable linear, square and T-type cluster states.