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Physics Today

Scalable entanglement in an optical frequency comb

Johanna L. Miller

Published Aug 18, 2011• 0 citations
Publisher

Abstract

Using a single nonlinear optical element, researchers have entangled dozens of the comb's optical modes. Using a single nonlinear optical element, researchers have entangled dozens of the comb's optical modes.
DOI
10.1063/pt.4.0337

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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 (Q modes), in the optical frequency comb of a single optical parametric oscillator. The amount of observed entanglement was constant over the 60 Q modes, thereby proving the intrinsic scalability of this system. The number of observable Q modes was restricted by technical limitations, and we conservatively estimate the actual number of similar clusters to be at least 3 times larger. This result paves the way to the realization of large entangled states for scalable quantum information and quantum computing.