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Q: Quantenoptik

Q 9: Poster: Quantum Information

Q 9.2: Poster

Tuesday, April 3, 2001, 12:30–15:00, AT2

Information Flow in Qubit Lattices — •Daniel E Browne, Robert Raussendorf, and Hans J Briegel — Theoretische Physik, Ludwig-Maximilians-Universität, Theresienstr. 37, D-80333 München.

Cluster states are highly entangled multi-particle states which occur naturally in a qubit lattice with an Ising-type interaction. Measurements of particles in the cluster exhibit certain quantum mechanical and classical correlations. These allow the processing of quantum information on the cluster through measurement alone, making a “one-way” quantum computer [1]. More generally, due to these correlations the process of measuring is accompanied by a flow of information. We construct a “classical” counterpart to the cluster state exhibiting the classical part of the correlations. In doing so we gain insight in the character of entanglement as a resource for performing quantum algorithms.

[1] R. Raussendorf and H. J. Briegel, quant-ph/0010033 (2000).