Parallel generation of quadripartite cluster entanglement in the optical frequency comb

TL;DR

This paper demonstrates the generation of 15 quadripartite entangled cluster states across 60 optical frequency modes in a single optical parametric oscillator, showing promising scalability for quantum computing.

Contribution

It reports the first simultaneous generation of multiple large-scale entangled states in an optical frequency comb, demonstrating intrinsic scalability.

Findings

Entanglement was observed consistently over 60 modes.

The number of modes is limited by technical constraints.

Estimated potential for at least three times more clusters.

Abstract

Scalability and coherence are two essential requirements for the experimental implementation of quantum information and quantum computing. Here, we report a breakthrough toward scalability: the simultaneous generation of a record 15 quadripartite entangled cluster states over 60 consecutive cavity modes (Qmodes), in the optical frequency comb of a single optical parametric oscillator. The amount of observed entanglement was constant over the 60 Qmodes, thereby proving the intrnisic scalability of this system. The number of observable Qmodes was restricted by technical limitations, and we conservatively estimate the actual number of similar clusters to be at least three times larger. This result paves the way to the realization of large entangled states for scalable quantum information and quantum computing.