Experimental generation of four-mode continuous-variable cluster states

TL;DR

This paper reports the experimental generation of three types of four-mode continuous-variable cluster states, which are promising for quantum computing, with minimized imperfections and no need for complex corrections during information propagation.

Contribution

The work demonstrates the first experimental realization of multiple four-mode continuous-variable cluster states with optimized correlations and minimal imperfections.

Findings

Successfully generated three types of four-mode cluster states

Cluster states exhibit correlations suitable for quantum information propagation

Imperfections from finite squeezing and thermal noise are minimized

Abstract

Continuous-variable Gaussian cluster states are a potential resource for universal quantum computation. They can be efficiently and unconditionally built from sources of squeezed light using beam splitters. Here we report on the generation of three different kinds of continuous-variable four-mode cluster states. In our realization, the resulting cluster-type correlations are such that no corrections other than simple phase-space displacements would be needed when quantum information propagates through these states. At the same time, the inevitable imperfections from the finitely squeezed resource states and from additional thermal noise are minimized, as no antisqueezing components are left in the cluster states.