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- Title
Experimental multiparticle entanglement dynamics induced by decoherence.
- Authors
Barreiro, Julio T.; Schindler, Philipp; Gühne, Otfried; Monz, Thomas; Chwalla, Michael; Roos, Christian F.; Hennrich, Markus; Blatt, Rainer
- Abstract
Multiparticle entanglement leads to richer correlations than two-particle entanglement and gives rise to striking contradictions with local realism, inequivalent classes of entanglement and applications such as one-way or topological quantum computing. When exposed to decohering or dissipative environments, multiparticle entanglement yields subtle dynamical features and access to new classes of states and applications. Here, using a string of trapped ions, we experimentally characterize the dynamics of entanglement of a multiparticle state under the influence of decoherence. By embedding an entangled state of four qubits in a decohering environment (through spontaneous decay), we observe a rich dynamics crossing distinctive domains: Bell-inequality violation, entanglement superactivation, bound entanglement and full separability. We also develop new theoretical tools for characterizing entanglement in quantum states. Recent quantum-computing, state-engineering and simulation paradigms driven by dissipative or decohering environments can benefit from the environment engineering techniques demonstrated here.
- Subjects
MULTIPLICITY of hadrons; COHERENCE (Physics); BELL'S theorem; QUANTUM theory; ENVIRONMENTAL engineering; PHYSICS
- Publication
Nature Physics, 2010, Vol 6, Issue 12, p943
- ISSN
1745-2473
- Publication type
Article
- DOI
10.1038/nphys1781