Multi-qubit production in spontaneous parametric down conversion

TL;DR

This paper introduces a new method using Gaussian masks to produce multiple entangled photon pairs via spontaneous parametric downconversion, enhancing the scalability of optical quantum systems.

Contribution

The authors develop a simple technique with Gaussian masks to generate multiple entangled pairs, increasing the dimensionality and scalability of quantum photonic systems.

Findings

Simultaneous multiple down-conversion emission cones observed

Technique allows increased entanglement dimensionality

Potential for scalable optical quantum computing

Abstract

We present a novel yet simple approach to produced multiple entangled photon pairs through spontaneous parametric downconversion. We have developed Gaussian masks to subdivide the pump beam before passing it through a nonlinear medium. In this way, we are able to observe simultaneous separate down-converted emission cones with spatial overlap. The technique we employ can be used to greatly increase the dimensionality of entangled photonic systems generated from spontaneous parametric down conversion, affording greater scalability to optical quantum computing than previously explored.