High-efficiency cluster-state generation with atomic ensembles via the dipole-blockade mechanism

Abstract

We demonstrate theoretically a scheme for cluster state generation, based on atomic ensembles and the dipole blockade mechanism. In the protocol, atomic ensembles serve as single qubit systems. Therefore, we review single-qubit operations on qubit defined as collective states of atomic ensemble. Our entangling protocol requires nearly identical single-photon sources, one ultra-cold ensemble per physical qubit, and regular photodetectors. The general entangling procedure is presented, as well as a procedure that generates in a single step Q-qubit GHZ states with success probability p_success ~ eta^{Q/2}, where eta is the combined detection and source efficiency. This is significantly more efficient than any known robust probabilistic entangling operation. GHZ states form the basic building block for universal cluster states, a resource for the one-way quantum computer.

10 pages with 8 figures, extended version of arXiv:0807.3645

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• Cluster state generation using van der Waals and dipole-dipole interactions in optical lattices
• Cluster State Generation with Spin-Orbit Coupled Fermionic Atoms in Optical Lattices
• Optical properties of an atomic ensemble coupled to a band edge of a photonic crystal waveguide
• High teleportation rates using cold-atom ensemble based quantum repeaters with Rydberg blockade
• Efficient generation of multiqubit entanglement states using rapid adiabatic passage
• Entangled photons from composite cascade emitters
• Quantum Information Processing with Continuous Variables and Atomic Ensembles