Efficient entanglement-length measurements for photonic-cluster-state sources

Structure of Multipartite Entanglement in Random Cluster-Like Photonic Systems

Quantum networks are natural scenarios for the communication of information among distributed parties, and the arena of promising schemes for distributed quantum computation. Measurement-based quantum computing is a prominent example of how quantum networking, embodied by the generation of a special class of multipartite states called cluster states, can be used to achieve a powerful paradigm f...

Efficient Generation of Photonic Entanglement and Multiparty Quantum Communication

Experimental preparation of eight-partite cluster state for photonic qumodes.

The preparation of multipartite entangled states is the prerequisite for exploring quantum information networks and quantum computation. In this Letter, we present what we believe is the first experimental demonstration of an eight-partite spatially separated continuous variable (CV) cluster state of optical modes. Via the linearly optical transformation of eight squeezed states of light, the e...

Photonic module: An on-demand resource for photonic entanglement

Simon J. Devitt, Andrew D. Greentree, Radu Ionicioiu, Jeremy L. O’Brien, William J. Munro, and Lloyd C. L. Hollenberg Centre for Quantum Computing Technology, School of Physics, University of Melbourne, Victoria 3010, Australia Hewlett-Packard Laboratories, Filton Road, Stoke Gifford, Bristol BS34 8QZ, United Kingdom Centre for Quantum Photonics, H. H. Wills Physics Laboratory and Department of...

Efficient entanglement criteria beyond Gaussian limits using Gaussian measurements.

We present a formalism to derive entanglement criteria beyond the Gaussian regime that can be readily tested by only homodyne detection. The measured observable is the Einstein-Podolsky-Rosen (EPR) correlation. Its arbitrary functional form enables us to detect non-Gaussian entanglement even when an entanglement test based on second-order moments fails. We illustrate the power of our experiment...