title: Parallel generation of quadripartite cluster entanglement in the optical frequency comb.
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 (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.
authors.affiliation: Department of Physics, University of Virginia, Charlottesville, Virginia 22903, USA.
authors.forename: Matthew
authors.initials: M
authors.lastname: Pysher
authors.forename: Yoshichika
authors.initials: Y
authors.lastname: Miwa
authors.forename: Reihaneh
authors.initials: R
authors.lastname: Shahrokhshahi
authors.forename: Russell
authors.initials: R
authors.lastname: Bloomer
authors.forename: Olivier
authors.initials: O
authors.lastname: Pfister